Key Valve Solutions for Urban Water Supply: Standards, Selection, Engineering Cases, and Advanced Manufacturing

I. Related Engineering Operating Conditions of Urban Water Supply

• Raw water: Contains suspended solids (10–50 mg/L), microorganisms (algae, bacteria), and dissolved salts (chloride, sulfate)—prone to scaling and biological fouling on valve internals.
• Purified water: Low impurity content (turbidity ≤1 NTU) but requires hygiene maintenance (valve internals must be smooth to avoid dirt accumulation).
• Secondary supply water: Often treated with disinfectants (chlorine, chlorine dioxide)—may cause mild corrosion to ordinary metals (e.g., carbon steel).
• Reclaimed water (for greening, industrial cooling): High organic matter and salt content (conductivity ≥1000 μS/cm)—stronger corrosiveness, requiring anti-corrosion materials.

• Temperature variations: -30℃ to -20℃ in cold northern regions (risk of freezing and cracking) and 35℃ to 40℃ in hot southern regions (risk of seal aging).
• Weather erosion: Rain, UV radiation, and industrial dust—requiring weather-resistant coatings (epoxy, polyurethane) and dust-proof structures.

II. Application-Process-Material-Engineering Matching in Urban Water Supply

A. Application-Process Matching

• Raw Water Intake Process: Responsible for extracting water from rivers, lakes, or reservoirs. Key valves here need to handle large flow rates (10,000–100,000 m³/day) and resist fouling—main functions include on-off control (stopping raw water intake during maintenance) and flow regulation (adjusting intake volume based on water demand).
• Water Purification Process: Includes coagulation, sedimentation, filtration, and disinfection. Valves here require precise flow control (to adjust chemical dosage, filter backwash flow) and hygiene preservation (no secondary pollution to purified water)—main functions include throttling, backwash control, and disinfectant injection control.
• Pipeline Transmission/Distribution Process: Transports purified water from water plants to residential and commercial areas via municipal pipelines (length 10–100 km). Valves here need to withstand long-distance pressure loss and enable zone isolation (for pipeline maintenance without large-scale water cuts)—main functions include on-off, isolation, and pressure stabilization.
• Secondary Water Supply Process: Boosts water pressure for high-rise buildings (≥9 floors) via booster pumps. Valves here need to resist high pressure and prevent backflow (to avoid polluting the municipal pipeline)—main functions include pressure regulation, backflow prevention, and overpressure protection.

B. Process-Material Matching

• Raw Water Intake Process:
  • Valve body: Ductile iron (ASTM A536, Grade 65-45-12)—high strength (tensile strength ≥485 MPa) and cost-effective, suitable for large-diameter valves (DN500–DN2000); internal coating: cement mortar (thickness ≥5 mm) to prevent raw water corrosion and scaling.
  • Seals: EPDM rubber (Shore A hardness 70–80)—good elasticity and resistance to microbial fouling (no algae adhesion).
• Water Purification Process:
  • Valve body: 304 stainless steel (ASTM A240)—low carbon content (≤0.08%) and high chromium content (18–20%)—excellent hygiene (no heavy metal dissolution) and corrosion resistance to disinfectants.
  • Seals: Food-grade PTFE (ASTM D4894)—non-toxic, high-temperature resistant (≤260℃), and compatible with chlorine-based disinfectants.
• Pipeline Transmission/Distribution Process:
  • Valve body: Lined ductile iron (ductile iron core + epoxy resin lining, thickness ≥0.3 mm)—balances cost and corrosion resistance (epoxy lining prevents internal rust and external weathering).
  • Trim (disc, stem): 304 stainless steel—avoids rust particles falling into the pipeline.
• Secondary Water Supply Process:
  • Valve body: 316 stainless steel (ASTM A240)—adds molybdenum (2–3%) compared to 304—stronger corrosion resistance to high-pressure water and residual disinfectants.
  • Seals: Fluororubber (FKM)—high-pressure resistance (up to 2.5 MPa) and aging resistance (service life ≥8 years).

C. Material-Engineering Matching

• Large-City Water Plants (daily output ≥500,000 m³): Require large-diameter valves (DN1000–DN2000) with long service life—lined ductile iron valves are preferred (cost-effective for large sizes, 20-year service life).
• Medium-Small Cities (daily output <200,000 m³): Prioritize cost-performance—ductile iron valves with cement mortar lining (meet basic corrosion resistance, 15-year service life).
• Cold Regions (northeast China, northern Europe): Valves need low-temperature resistance—ductile iron valves undergo -40℃ impact testing; seals use low-temperature EPDM (operating temperature -40℃ to 120℃) to avoid freezing and cracking.
• Coastal Regions (southeast China, coastal Europe): High air humidity and salt content—316 stainless steel valves or epoxy-coated ductile iron valves (prevent salt spray corrosion).
• High-Rise Concentrated Areas (metropolitan centers): Secondary water supply systems use 316 stainless steel valves (resist high pressure and disinfectant corrosion) to ensure water quality for high-rise residents.

III. Common Valve Types in Urban Water Supply (with TIANYU Product Links from tianyuvalves.com)

A. Gate Valves: For Pipeline Isolation and On-Off Control

B. Butterfly Valves: For Large-Flow Regulation and Zone Control

C. Check Valves: For Backflow Prevention

• Swing Check Valves: Used in low-pressure transmission pipelines (≤0.6 MPa)—large flow capacity, low pressure loss; ductile iron body, EPDM seal.
• Lift Check Valves: Used in high-pressure secondary water supply systems (≥1.0 MPa)—tight sealing (Class V), 304 stainless steel body, PTFE seal.
   
  Both comply with GB/T 12236 and API 6D, with a closing time of ≤1 second (preventing water hammer).
   
  TIANYU Urban Water Supply Check Valves: https://www.tianyuvalves.com/water-supply-check-valves

D. Globe Valves: For Precise Small-Flow Regulation

E. Pressure Reducing Valves: For Secondary Water Supply Pressure Stabilization

IV. Specification Parameters of Urban Water Supply Valves

A. Nominal Diameter (DN/NPS)

• Definition: The nominal inner diameter of the valve flow channel—determines the maximum flow capacity.
• Range for Urban Water Supply: DN50–DN2000 (NPS 2″–NPS 80″):
  • DN50–DN200: Used for secondary water supply pipelines, water plant chemical dosing lines, and residential branch lines.
  • DN250–DN800: Used for municipal distribution pipelines (connecting communities and commercial areas).
  • DN900–DN2000: Used for water plant intake/outlet main lines and municipal transmission main lines (connecting water plants and districts).
• Engineering Significance: Matching the pipeline diameter to ensure sufficient flow. For example, a water plant with a daily output of 300,000 m³ uses DN1500 gate valves for its outlet main line (supporting 12,500 m³/h flow).

B. Nominal Pressure (PN/Class)

• Definition: The maximum pressure the valve can withstand at the rated temperature—ensuring safety under system pressure.
• Range for Urban Water Supply: PN1.0–PN2.5 MPa (Class 150–Class 300):
  • PN1.0 MPa (Class 150): Used for low-pressure municipal distribution pipelines (≤6-story buildings) and water plant purification lines.
  • PN1.6 MPa (Class 250): Used for medium-pressure transmission pipelines (6–12-story buildings) and secondary water supply booster pump inlets.
  • PN2.5 MPa (Class 300): Used for high-pressure secondary water supply systems (≥12-story buildings) and long-distance transmission pipelines (≥50 km).
• Standard Compliance: GB/T 12224 requires valves to pass a 1.5x PN hydrostatic test (holding 10 minutes, no leakage) and a 1.1x PN pneumatic test (holding 5 minutes, no leakage).

C. Temperature Range

• Definition: The minimum and maximum temperatures the valve can withstand during continuous operation—adapt to regional climate.
• Range for Urban Water Supply: -40℃ to 80℃:
  • -40℃ to 60℃: Valves with EPDM seals (cold regions, e.g., northeast China, Russia).
  • -20℃ to 80℃: Valves with FKM/PTFE seals (temperate and hot regions, e.g., central China, Southeast Asia).
• Engineering Significance: Preventing seal aging or valve cracking. For example, valves in Harbin (winter -30℃) use -40℃ rated EPDM seals to avoid freezing damage.

D. Sealing Grade

• Definition: The leakage rate of the valve—critical for water conservation and water quality safety.
• Common Grades for Urban Water Supply:
  • Class IV: Allowable leakage (gate valves in non-critical transmission lines, leakage ≤0.1% of rated flow).
  • Class V: Low leakage (butterfly valves in zone control lines, leakage ≤0.01% of rated flow).
  • Class VI: Ultra-low leakage (check valves in secondary water supply lines, globe valves in chemical dosing lines, leakage ≤0.001% of rated flow).
• Testing Method: For Class VI sealing, use the bubble test (0.6 MPa air pressure, no visible bubbles) or water leakage test (leakage volume ≤0.1 cm³/min for DN50 valves).

E. Hygiene Certification

• Mandatory Certifications: Valves in contact with drinking water must have hygiene certifications:
  • International: NSF/ANSI 61 (US, Canada), WRAS (UK), KTW (Germany).
  • Domestic: GB 4806.11 (China), CJ/T 419 (China Urban Water Supply and Drainage Association).
• Testing Requirements: Certifications require testing for heavy metal dissolution (lead, mercury, cadmium), organic compound release (VOCs), and microbial growth (no bacteria adhesion on valve internals).

F. Connection Type

• Common Types for Urban Water Supply:
  • Flanged Connection (GB/T 9119, ANSI B16.5): Used for large-diameter valves (DN200+) and high-pressure lines (PN≥1.6 MPa)—easy installation and maintenance, e.g., water plant main line gate valves.
  • Groove Connection (GB/T 19672): Used for medium-diameter valves (DN50–DN200) and municipal distribution lines—fast installation (no welding), e.g., community branch line butterfly valves.
  • Threaded Connection (GB/T 7307, NPT): Used for small-diameter valves (DN50≤) and secondary water supply equipment connections—compact structure, e.g., chemical dosing line globe valves.

V. Key Selection Parameters and Engineering Cases of Urban Water Supply Valves

A. Key Selection Parameters

1. Medium Type: The most fundamental factor—determines material and seal selection. For example:
   • Raw water: Choose ductile iron valves with cement mortar lining (resist scaling).
   • Purified water: Choose 304 stainless steel valves with food-grade PTFE seals (meet hygiene standards).
   • Secondary supply water: Choose 316 stainless steel valves with FKM seals (resist disinfectant corrosion).
   • Reclaimed water: Choose double-phase stainless steel (S31803) valves (resist high salt corrosion).
2. System Pressure and Flow: Match PN and DN to system conditions. A 20-story building’s secondary water supply needs PN2.5 MPa valves; a municipal main line with 8,000 m³/h flow needs DN1200 valves.
3. Regulation Requirements: Select valve type based on control precision. Chemical dosing lines (need ±5% flow accuracy) use globe valves; zone control lines (need simple on-off) use gate valves.
4. Hygiene Requirements: Valves in contact with drinking water must have NSF/GB 4806 certification; non-drinking water (reclaimed water) can use ordinary corrosion-resistant valves.
5. Installation Environment: Outdoor valves need weather-resistant coatings (epoxy); underground valves need anti-corrosion linings (polyurethane); cold-region valves need low-temperature-resistant seals.
6. Maintenance Conditions: Valves in hard-to-reach areas (underground pipelines) need long service life (≥15 years) and low maintenance (self-lubricating stems); valves in water plants (easy maintenance) can use standard designs.

B. Engineering Cases

Case 1: Municipal Pipeline Reconstruction Project in Shanghai (Length 25 km, Serving 500,000 Residents)

• Challenges: Old pipelines (30 years old) had frequent leaks; need to replace valves with long service life (≥20 years) and low maintenance; system pressure 0.4 MPa, maximum flow 10,000 m³/h.
• Valve Selection:
  • Main line isolation: TIANYU PN1.6 DN1200 lined ductile iron gate valves (epoxy lining, anti-corrosion; full-bore, low flow resistance; comply with GB/T 12233).
  • Zone control: TIANYU PN1.6 DN800 double-eccentric butterfly valves (wafer type, easy installation; EPDM seals, -20℃ to 80℃; Class V sealing).
  • Backflow prevention: TIANYU PN1.6 DN600 swing check valves (ductile iron body, 304 stainless steel disc; closing time ≤1 second, no water hammer).
• Results: After 5 years of operation, valve failure rate was 0.2% (far below the old system’s 5%); annual water loss reduced by 800,000 m³ (saving 1.2 million yuan); maintenance frequency reduced from 4 times/year to 1 time/year.

Case 2: Secondary Water Supply Renovation in Beijing High-Rise Community (30 Buildings, 15–25 Floors)

• Challenges: High water pressure (1.8 MPa) caused frequent pipe bursts; old valves had poor sealing (water leakage); residents complained about water quality (rust in tap water).
• Valve Selection:
  • Pressure stabilization: TIANYU PN2.5 DN100 316 stainless steel pressure reducing valves (set pressure 0.4–0.6 MPa; ±5% pressure stability; built-in filter).
  • Backflow prevention: TIANYU PN2.5 DN100 lift check valves (316 stainless steel body, PTFE seals; Class VI sealing, no backflow; comply with GB/T 12236).
  • Water tank inlet control: TIANYU PN1.6 DN80 304 stainless steel globe valves (food-grade PTFE seals; NSF 61 certified; precise flow control).
• Results: Pipe burst incidents reduced from 12 times/year to 0; tap water turbidity reduced from 2 NTU to 0.8 NTU (meeting national drinking water standards); resident satisfaction increased from 65% to 98%.

Case 3: Reclaimed Water Reuse Project in Shenzhen (Daily Output 50,000 m³, for Greening and Industrial Cooling)

• Challenges: Reclaimed water had high salt content (conductivity 1500 μS/cm) and organic matter (COD 50 mg/L); valves needed strong corrosion resistance (≥10 years service life); system pressure 0.6 MPa.
• Valve Selection:
  • Reclaimed water transmission: TIANYU PN1.0 DN600 double-phase stainless steel (S31803) butterfly valves (double-eccentric design; FKM seals, resist corrosion; Class V sealing).
  • Cooling water inlet control: TIANYU PN1.0 DN300 double-phase stainless steel ball valves (full-bore, low pressure loss; metal-to-metal sealing, wear resistance).
  • Backflow prevention: TIANYU PN1.0 DN400 double-phase stainless steel check valves (swing type, large flow capacity; corrosion-resistant trim).
• Results: After 3 years of operation, valves showed no corrosion (annual inspection via endoscope); reclaimed water reuse rate reached 95% (saving 18 million m³ of tap water annually); maintenance costs were 30% lower than traditional carbon steel valves.

VI. Manufacturing Processes of TIANYU Urban Water Supply Valves

A. Factory Production Capabilities (from tianyuvalves.com)

• Advanced Production Equipment: 15 CNC machining centers (5-axis, for precision processing of valve bodies and trim), 10 automatic assembly lines (for gate/butterfly valves, daily output 800 units), 3 special hygiene-level processing lines (for stainless steel valves, meeting NSF 61 standards), and 2 anti-corrosion coating lines (epoxy, cement mortar, daily coating capacity 500 m²).
• Professional Testing Facilities: 8 hydrostatic/pneumatic test benches (0–4.0 MPa pressure range), 3 hygiene testing laboratories (heavy metal dissolution, microbial growth), 2 low-temperature test chambers (-40℃ to 0℃), 1 salt spray test chamber (ASTM B117 standard), and 1 flow characteristic test bench (measuring KV and regulation accuracy).
• Quality Control Team: 35 engineers with 7+ years of water supply valve experience, including 5 hygiene certification specialists (familiar with NSF/WRAS/GB 4806 standards) and 8 non-destructive testing (NDT) technicians (UT, MT, PT testing).
• Production Capacity: Monthly production of 20,000 urban water supply valves; large-diameter valves (DN1000+) have a 30-day delivery cycle; emergency orders (e.g., pipeline burst replacement) can be delivered within 48 hours.

B. Core Manufacturing Processes

1. Raw Material Inspection

• Metal Materials:
  • Ductile iron (ASTM A536): Test tensile strength (≥485 MPa), elongation (≥10%), and impact toughness (≥15 J at -20℃); no cracks or inclusions (detected via MT).
  • Stainless steel (304/316/S31803): Test chemical composition (via spectral analysis—304: Cr 18–20%, Ni 8–10%; 316: Mo 2–3%) and corrosion resistance (salt spray test, 500 hours no rust).
• Non-Metal Materials:
  • EPDM/PTFE/FKM seals: Test hardness (Shore A 65–85), tensile strength (≥10 MPa), and hygiene (heavy metal dissolution ≤5 μg/L, meet GB 4806.11).
  • Coatings/Linings (epoxy, cement mortar): Test thickness (epoxy ≥0.3 mm, cement mortar ≥5 mm) and adhesion (pull-off strength ≥5 MPa).
• Welding Materials: Stainless steel welding wire (ER308L/ER316L) test weld strength (≥80% of base material) and corrosion resistance (post-weld salt spray test).

2. Precision Processing

• Valve Body:
  • Ductile iron bodies: Machined by 5-axis CNC lathes (dimensional tolerance ±0.02 mm); internal flow channels polished to Ra ≤1.6 μm (reducing scaling); external surface shot-blasted (Sa 2.5 grade) before coating.
  • Stainless steel bodies: Machined by CNC milling machines; internal surfaces passivated (forming a Cr-rich oxide film, thickness ≥0.005 mm) to enhance corrosion resistance; hygiene-level valves undergo electrolytic polishing (Ra ≤0.8 μm, no dirt accumulation).
• Trim (Disc, Plug, Stem):
  • Ductile iron discs: Coated with 304 stainless steel via thermal spraying (thickness 0.1–0.2 mm, anti-corrosion); lapped with diamond paste (flatness ≤0.005 mm, ensuring sealing).
  • Stainless steel stems: Ground by precision grinding machines (surface roughness Ra ≤0.8 μm, concentricity ≤0.01 mm); hygiene-level stems undergo electropolishing (no burrs, preventing bacterial adhesion).
  • Stellite trim (for globe valves): Welded via plasma arc (thickness 2–3 mm, hardness HRC 40–45, wear resistance); lapped to Ra ≤0.4 μm.
• Coating/Lining Application:
  • Epoxy coating: Applied via electrostatic spraying (thickness 0.3–0.5 mm); cured at 180℃ for 2 hours (no pinholes, tested via spark tester).
  • Cement mortar lining: Poured manually (thickness 5–8 mm); cured at 20℃ for 7 days (compressive strength ≥30 MPa, no cracking).

3. Assembly

• Seal Installation:
  • Hygiene-level seals (PTFE/FKM): Installed in a clean room (class 100,000) to avoid contamination; press-fitted with interference fit (0.05–0.1 mm) to ensure no displacement.
  • Ordinary seals (EPDM): Installed with special tools to avoid deformation; coated with food-grade lubricant (for hygiene valves) to reduce friction.
• Stem Assembly: Stems are assembled with packing glands (flexible graphite for gate valves, PTFE for globe valves); pre-compressed to ensure no external leakage (tested with 0.6 MPa air pressure, no bubbles).
• Actuator Integration: Electric actuators (for automatic valves) are calibrated to ensure opening/closing time (≤30 seconds for butterfly valves, ≤60 seconds for gate valves); manual overrides are tested (10 cycles, smooth operation).
• Concentricity Adjustment: Laser alignment tools are used to align the stem and disc (error ≤0.02 mm), preventing jamming during operation.

4. Strict Testing

• Pressure Testing: 100% of valves undergo hydrostatic test (1.5x PN, 10 minutes) and pneumatic test (1.1x PN, 5 minutes); hygiene-level valves use purified water for testing (avoiding medium contamination).
• Sealing Testing: Class VI valves undergo bubble test (0.6 MPa air pressure, 5 minutes, no visible bubbles) or water leakage test (leakage ≤0.1 cm³/min for DN50).
• Hygiene Testing: Hygiene-level valves undergo heavy metal dissolution test (lead ≤5 μg/L, mercury ≤1 μg/L) and microbial test (no bacteria growth after 72 hours of immersion in nutrient solution).
• Flow Characteristic Testing: Globe valves and butterfly valves undergo flow test (measuring KV value and regulation accuracy—accuracy ±5% for globe valves).
• Low-Temperature Testing: Valves for cold regions are tested in -40℃ chambers (24 hours), then actuated (must open/close normally, no cracking).
• Life Testing: Each valve type undergoes 5,000 opening/closing cycles (simulating 15 years of use), with no performance degradation (sealing, actuation force).

5. Marking and Packaging

• Marking: Each valve is marked with DN, PN, material, serial number, hygiene certification logo (if applicable), and manufacturing date—serial numbers are traceable via TIANYU’s official website (query raw material, processing, and test records).
• Packaging: Hygiene-level valves are packaged in food-grade plastic bags (meet GB 4806) and cartons; large-diameter valves are packaged in wooden crates (waterproof, shockproof); outdoor valves are coated with anti-rust oil before packaging.

VII. Advantages of TIANYU Urban Water Supply Valves

A. Hygiene Advantage: Meet Global Drinking Water Standards

• Hygiene Material Selection: All materials in contact with drinking water comply with NSF/ANSI 61, GB 4806.11, and WRAS standards. For example, 304 stainless steel meets ASTM A240 (low carbon, no heavy metal dissolution); food-grade PTFE meets ASTM D4894 (non-toxic, no plasticizer release).
• Hygiene Processing: Hygiene-level valves undergo electrolytic polishing (Ra ≤0.8 μm) and clean room assembly (class 100,000)—no dirt accumulation or bacterial adhesion. Post-production, they undergo microbial testing (no coliforms, total bacteria ≤10 CFU/mL).
• Full Hygiene Certification: TIANYU’s urban water supply valves have obtained NSF/ANSI 61, WRAS, KTW, and GB 4806 certifications—suitable for drinking water projects in global markets (US, EU, Southeast Asia).

B. Corrosion Resistance Advantage: Adapt to Diverse Media

• Multi-Material Options: Provide ductile iron (with cement mortar/epoxy lining), 304/316 stainless steel, and double-phase stainless steel (S31803) valves—adapt to raw water, purified water, secondary supply water, and reclaimed water.
• Advanced Anti-Corrosion Processes: Epoxy coatings use electrostatic spraying (thickness 0.3–0.5 mm, 10-year anti-rust guarantee); stainless steel passivation (Cr-rich oxide film, corrosion rate ≤0.01 mm/year); double-phase stainless steel valves resist high salt corrosion (suitable for coastal and reclaimed water projects).
• Corrosion Testing: All corrosion-resistant valves undergo 1,000-hour salt spray tests (ASTM B117) and 500-hour immersion tests in reclaimed water (conductivity 1500 μS/cm)—no rust or seal aging.

C. Reliability Advantage: Long Service Life and Low Failure

• High-Strength Structure: Ductile iron valves have a tensile strength of ≥485 MPa (2x higher than gray cast iron); stainless steel valves use integral forging (no welding defects, detected via UT).
• Wear-Resistant Trim: Globe valve plugs use Stellite alloy overlay (service life ≥10 years); butterfly valve discs use 304 stainless steel overlay (wear resistance 3x higher than ordinary ductile iron).
• Low Failure Rate: After accelerated life testing (simulating 20 years of use), the failure rate is <0.1% (industry average is 1.2%); the average service life is 15–20 years (30% longer than industry average).

D. Performance Advantage: Precise Control and Energy Saving

• High Regulation Precision: Globe valves have a regulation accuracy of ±5% (meet chemical dosing and pressure stabilization needs); butterfly valves have a flow coefficient (KV) 20% higher than traditional designs (reducing pump energy consumption).
• Water Hammer Prevention: Check valves have a closing time of ≤1 second (preventing pipe bursts from water hammer); pressure reducing valves have a pressure stability of ±5% (avoiding high-pressure damage to pipelines).
• Energy Saving: Full-bore gate valves and ball valves have a flow resistance coefficient (ζ) of ≤0.1 (industry average is 0.3)—for a 100,000 m³/day water plant, this reduces annual pump energy consumption by 8–10% (saving 50,000–80,000 yuan).

E. Cost-Effectiveness Advantage: Balance Quality and Price

• Reasonable Material Matching: Provide customized material solutions based on project budget—high-budget drinking water projects use 316 stainless steel; low-budget non-drinking water projects use lined ductile iron (cost reduced by 40% compared to stainless steel).
• Low Maintenance Cost: Valves use self-lubricating stems (no annual lubrication) and corrosion-resistant coatings (no regular painting)—annual maintenance cost is ≤5% of the valve price (industry average is 10–15%).
• Long Service Life: 15–20-year service life reduces replacement frequency—life-cycle cost (purchase + maintenance + replacement) is 30% lower than short-life valves (5–8 years).

F. Service Advantage: Full-Lifecycle Support

• Pre-Sales Consulting: A team of 12 water supply engineering specialists (with 10+ years of experience) provides selection advice based on project type (municipal, secondary supply, reclaimed water) and local standards (e.g., NSF for US, GB for China). They also provide 2D/3D drawings and flow characteristic curves for system design.
• On-Site Service: Engineers are dispatched to guide installation and commissioning (global response time ≤72 hours); for large projects (≥1,000 valves), a dedicated on-site team is assigned to supervise the entire process.
• After-Sales Warranty: 2-year warranty for standard valves, 3-year warranty for stainless steel/hygiene-level valves; free replacement if valves fail due to quality issues (including corrosion and sealing failure).
• Training Support: Regular training for customer maintenance teams (valve disassembly, inspection, lubrication, troubleshooting) to extend valve service life. For municipal customers, annual free inspection is provided (valve status assessment, maintenance suggestions).

VIII. Future Applications of Urban Water Supply Valves

A. Intelligent Valves for Smart Water Supply Systems

• TIANYU’s R&D Direction: Develop intelligent urban water supply valves integrated with sensors (pressure, flow, temperature, vibration) and LoRa/NB-IoT communication modules.
• Key Functions:
  • Real-time status monitoring: Transmit valve opening degree, pressure, flow, and leakage data to the smart water supply platform (e.g., alert if pressure exceeds 1.2x set value or leakage occurs).
  • Remote control: Open/close valves or adjust flow via the platform (for unmanned areas like underground pipelines or remote water plants).
  • Predictive maintenance: AI algorithm analyzes vibration and leakage data to predict failures (e.g., alert for stem wear 6 months in advance, avoiding unplanned shutdowns).
• Application Scenario: Smart cities and large municipal water supply networks—e.g., a smart water supply project in Hangzhou using TIANYU’s intelligent butterfly valves to achieve 90% automated monitoring and 50% reduction in maintenance workload.

B. Energy-Saving Valves for Water Conservation

• TIANYU’s R&D Direction:
  • Low-flow-resistance valves: Optimize valve flow channel design (e.g., streamlined gate valve discs, curved butterfly valve seats) to reduce flow resistance coefficient (ζ) to ≤0.05 (industry average 0.3)—cut pump energy consumption by 15–20%.
  • Leakage-free valves: Develop Class VI+ sealing valves (leakage ≤0.0001% of rated flow) for municipal main lines—reduce annual water loss by 10–15% (for a 10 million population city, saving 50 million m³ of water annually).
  • Variable flow control valves: Integrate flow sensors and actuators to automatically adjust flow based on water demand (e.g., reducing flow by 30% during low-demand periods at night)—save 8–12% of pump energy.
• Application Scenario: Water-scarce regions (northwest China, Middle East) and energy-saving water plants—e.g., a water plant in 银川 using TIANYU’s low-flow-resistance gate valves to reduce annual energy consumption by 180,000 kWh.

C. Hygiene-Enhanced Valves for High-Quality Water Supply

• TIANYU’s R&D Direction:
  • Ultra-hygiene materials: Develop medical-grade stainless steel (316L MOD) valves (low carbon, low sulfur) and silicone-free seals (avoiding silicone migration into water).
  • Self-sterilizing valves: Integrate UV lamps or silver ion coatings into valve internals—kill bacteria (coliforms, Legionella) on valve surfaces (sterilization rate ≥99%).
  • Online cleaning (CIP) valves: Design valves with no dead zones (flow channel smoothness Ra ≤0.4 μm) and CIP interfaces—enable in-situ cleaning without disassembling the valve (suitable for high-end residential areas and hospitals).
• Application Scenario: High-end residential areas, hospitals, and baby food factories—e.g., a luxury community in Shanghai using TIANYU’s self-sterilizing valves to ensure tap water meets direct drinking standards (bacteria ≤1 CFU/mL).

D. Integrated Valve Solutions for Secondary Water Supply

• TIANYU’s R&D Direction: Develop integrated secondary water supply units (valves + pumps + sensors + control system)—pre-assembled and tested in the factory, ready for on-site installation.
• Key Advantages:
  • Compact structure: Reduce installation space by 40% (suitable for small machine rooms in high-rises).
  • Coordinated control: Valves and pumps communicate in real time (e.g., pressure reducing valves adjust pressure based on pump output)—improve pressure stability (±3% of set pressure).
  • Easy maintenance: Centralized monitoring and maintenance (one-click fault diagnosis)—reduce maintenance time by 60%.
• Application Scenario: High-rise communities and commercial buildings—e.g., a 40-story office building in Guangzhou using TIANYU’s integrated unit to achieve stable water supply (no low water pressure complaints) and 25% reduction in installation time.

Conclusion: TIANYU’s Custom Advantages for Urban Water Supply Valves