High Quality Manual Flat Gate Valve Carbon Steel Hard Seal Gate Valve With Guide Slab Gate Valve

Product Attribute: Size Range: DN50-DN600 / 2″-24″
Pressure Class: PN10/PN16 / 1.0MPa/1.6MPa
Temperature Range: carbon steel -29°C to 425°C; stainless steel -196°C to 600°C
Materials & Construction
Body & Bonnet: WCB carbon steel, CF8 304 stainless steel, CF8M 316 stainless steel
Gate & Seat: carbon steel models: 1Cr13/2Cr13 stainless steel with hardfacing; stainless steel models: SS304/316
Stem: 2Cr13 stainless steel, anti-corrosion treatment
Packing: flexible graphite, PTFE, asbestos-free materials
Gasket: spiral-wound gasket, SS304+graphite
Connection & Operation
Flange Standard: ASME B16.5, GB/T 9113, DIN 2501
End Connection: RF raised face / FF flat face
Operation Mode: manual handwheel, bevel gear drive

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Specification

Manual Carbon Steel Hard Seal Slab Gate Valve

I. Product Overview

TIANYU manual flat gate valves are designed for precise flow control in industrial pipelines, adhering to GB/T 12234 standards. Featuring a flat gate design and flange connection, these valves are crafted from high-quality carbon steel (WCB) or stainless steel (304/316), offering reliable shut-off capabilities for various media, including water, steam, oil, and gas. With nominal diameters ranging from DN50 to DN600 and pressure ratings up to PN16, these valves are suitable for diverse applications in chemical, petroleum, power generation, and water treatment industries.

II. Core Technical Specifications

Nominal Diameter & Pressure Rating
- Size Range: DN50-DN600 (2”-24”)
- Pressure Class: PN10/PN16 (1.0MPa/1.6MPa)
- Temperature Range: -29°C to 425°C (carbon steel); -196°C to 600°C (stainless steel)
Materials & Construction
- Body & Bonnet: WCB (carbon steel), CF8 (304 stainless steel), CF8M (316 stainless steel)
- Gate & Seat: 1Cr13/2Cr13 stainless steel with hardfacing (carbon steel models); SS304/316 (stainless steel models)
- Stem: 2Cr13 stainless steel, anti-corrosion treatment
- Packing: Flexible graphite, PTFE, or asbestos-free materials
- Gasket: Spiral-wound gasket (SS304+graphite)
Connection & Operation
- Flange Standard: ASME B16.5, GB/T 9113, DIN 2501
- End Connection: RF (raised face) or FF (flat face)
- Operation Mode: Manual handwheel or bevel gear drive

Product Overview

III. Design Features & Advantages

Flat Gate Structure
- Full-bore design minimizes flow resistance (Cv value up to 30% higher than conventional gate valves)
- Parallel seat design ensures bidirectional sealing with zero leakage
- Anti-friction graphite coating reduces operating torque by 25%
Robust Sealing System
- Metal-to-metal sealing with STL alloy overlay on seats (hardness ≥HRC45)
- Secondary soft seal (NBR/PTFE) provides redundant sealing under low pressure
- Stem sealing with V-ring packing, tested to 10,000 cycles without leakage
Reliable Stem Design
- Non-rising stem with trapezoidal thread (ACME thread form)
- Thrust bearing reduces friction during operation
- Anti-blowout stem design ensures safety under high pressure

IV. Manufacturing Process & Quality Control

Precision Casting
- Investment casting for complex components with dimensional accuracy ≤±0.5mm
- Ultrasonic testing (UT) and magnetic particle inspection (MPI) for defect detection
- Heat treatment (normalizing/tempering) to enhance material properties
Advanced Machining
- CNC machining centers ensure surface roughness Ra≤3.2μm
- Seat sealing surface ground to flatness ≤0.02mm
- Stem thread pitch accuracy ≤±0.01mm
Stringent Testing
- Hydrostatic test: 1.5x working pressure for shell, 1.1x for sealing (30-minute hold time)
- Gas tightness test with nitrogen at 0.6MPa
- Low-temperature test (-46°C) for cryogenic applications

Valve Details

V. Key Product Advantages

High Pressure & Temperature Resistance
- Withstands pressures up to 1.6MPa and temperatures from -29°C to 425°C
- Suitable for high-pressure steam systems and industrial pipelines
Corrosion Resistance
- Stainless steel options (304/316) for corrosive environments
- Epoxy coating (FBE) for carbon steel valves in harsh conditions
Long Service Life
- Anti-wear gate and seat design for over 10,000 operation cycles
- Low maintenance requirements with replaceable sealing components
Compliance with Standards
- API 6D, ASME B16.34, ISO 5208, GB/T 12234 certifications
- Fire-safe design compliant with API 6FA

Application

VI. Application Scenarios

Water Treatment
- Municipal water supply and drainage systems
- Wastewater treatment plants for flow isolation
Petroleum & Chemical
- Refineries, pipelines, and storage facilities
- Corrosive medium control (acids, alkalis, solvents)
Power Generation
- Steam and condensate systems in thermal power plants
- Cooling water circuits in nuclear power plants
Building Services
- HVAC systems for commercial and industrial buildings
- Fire protection systems requiring reliable shut-off valves

VII. Customization Options

Material Upgrade
- Duplex stainless steel (2205/2507) for seawater applications
- Alloy 20 for sulfuric acid environments
Actuation Methods
- Pneumatic/hydraulic actuators for automated control
- Electric actuators with MODBUS communication protocol
Special Features
- Extended bonnet for cryogenic applications
- Anti-static design for explosive environments
- Locking device for safety-critical applications

VIII. Installation & Maintenance Guidelines

Installation
- Ensure pipeline alignment within 0.5mm/m
- Torque flange bolts according to ASME PCC-1 standards
- Install with valve fully open to prevent damage during pipeline purging
Maintenance
- Inspect packing gland tightness annually
- Lubricate stem threads every 6 months
- Replace gaskets during system overhauls
Troubleshooting
- Leakage: Check gasket compression and replace if necessary
- Difficulty in operation: Lubricate stem or replace thrust bearing
- Stem leakage: Adjust packing gland or replace packing rings