Specification

TIANYU PN16 WCB Cast Steel Single/Double Flange Gate Valve for Water, Oil, Gas, and Industrial Pipeline Applications

I. Product Overview

TIANYU PN16 WCB cast steel single/double flange gate valve is a robust industrial valve engineered for reliable on-off flow control in medium-pressure pipeline systems. Constructed with WCB cast carbon steel—known for its excellent mechanical strength and temperature resistance—this valve features a gate-type closure mechanism and versatile single or double flange connections, designed to meet the demands of diverse industrial media including water, oil, gas, and neutral fluids. Its structure emphasizes tight sealing, durability under cyclic operation, and adaptability to varying temperatures, making it a critical component in systems where secure shutoff and long service life are paramount. Whether integrated into municipal water networks, petroleum pipelines, chemical plants, or power generation facilities, this valve delivers consistent performance, ensuring operational stability across a broad range of pressure and temperature conditions.

II. Key Attributes and Specification Parameters

1. Basic Attributes

Structure Design: Gate valve with a rising stem (non-rising stem optional) and wedge-type gate, ensuring linear movement of the gate to open or close the flow path. The wedge design provides tight sealing by leveraging line pressure to enhance contact between the gate and seat, critical for preventing leakage in high-pressure applications.
Body Material: WCB cast carbon steel, a widely used industrial material prized for its high tensile strength (≥415MPa), good impact resistance, and suitability for temperatures up to 425℃. WCB offers an optimal balance of durability and cost-effectiveness for medium-pressure systems.
Trim Materials:
- Valve stem: 2Cr13 stainless steel, providing corrosion resistance and sufficient strength to withstand axial loads during gate operation.
- Gate and seat: Carbon steel with overlay welding of hard alloy (e.g., Stellite) on sealing surfaces, enhancing wear and erosion resistance—ideal for media with minor solid particles or turbulent flow.
Pressure Rating: PN16 (1.6MPa), suitable for medium-pressure industrial pipelines, including municipal water supply, oil distribution, and low-pressure steam systems.
Nominal Diameter Range: Covers small to large pipeline sizes, with common specifications from DN15 to DN600, accommodating diverse flow rate requirements from residential pipelines to industrial mainlines.
Temperature Range: -29℃ to 425℃, enabling reliable operation in both low-temperature (e.g., cold water) and medium-high temperature (e.g., hot oil, low-pressure steam) environments.
Media Compatibility: Versatile for use with clean water, raw water, sewage, crude oil, refined petroleum products, natural gas, LPG, and neutral industrial fluids, ensuring adaptability across sectors.
Connection Type: Available in single flange and double flange configurations, conforming to PN16 flange standards (GB/T 9113, EN 1092-1). Single flange designs simplify installation in space-constrained areas, while double flange options provide enhanced stability in high-vibration pipelines.
Operation Modes: Supports multiple drive methods to suit system needs:
- Manual: Handwheel operation with a trapezoidal thread stem, ensuring precise gate movement and self-locking to prevent unintended closure.
- Electric: Motorized actuator for remote control, ideal for large-diameter valves (DN300+) or hard-to-reach locations.
- Pneumatic: Air-driven actuator for quick on-off response, suitable for automated process systems.
Sealing Type: Metal-to-metal hard seal between the gate and seat, with optional soft seal inserts (PTFE) for applications requiring bubble-tight shutoff in low-pressure, clean media.
Design Standards: Complies with international and domestic norms, including GB/T 12234 (cast steel gate valves), API 600 (flanged steel gate valves), and EN 13709, ensuring compatibility with global pipeline systems.

Product Overview

III. Product Features

TIANYU PN16 WCB cast steel flange gate valve is distinguished by features that enhance its performance, reliability, and adaptability in industrial applications:

Wedge Gate Sealing Excellence: The wedge-type gate design ensures uniform contact with the valve seat under line pressure, creating a tight seal that improves with increasing pressure—critical for preventing leakage in oil and gas pipelines. The wedge can be solid or flexible (split wedge), with flexible designs accommodating minor pipeline misalignment or thermal expansion.
Dual Flange Versatility: Single and double flange options provide installation flexibility. Single flange valves are ideal for systems where one end connects to a fixed pipeline and the other to a removable component (e.g., pumps), while double flange designs offer secure mounting between two fixed flanges, reducing stress on pipeline joints in high-vibration environments.
Rising Stem Visibility: The rising stem design (standard) provides visual confirmation of valve position—fully open when the stem is extended, fully closed when retracted—eliminating ambiguity in manual operation and simplifying system troubleshooting. Non-rising stems are available for space-constrained applications, with position indicators for status tracking.
Robust Stem Protection: The stem is protected by a gland packing system, typically featuring flexible graphite or PTFE packing rings, preventing external leakage and ensuring smooth operation. The packing is designed to be adjustable, allowing for maintenance without disassembling the valve body.
Bidirectional Sealing: The valve body and gate are engineered for bidirectional sealing, enabling installation without regard to media flow direction. This simplifies on-site installation, reduces errors, and enhances versatility in reversible pipeline systems (e.g., water distribution networks with variable flow).
High-Temperature Tolerance: WCB cast steel retains its mechanical properties at temperatures up to 425℃, making the valve suitable for medium-pressure steam lines in power plants or hot oil circuits in refineries, where thermal stability is critical.
Erosion Resistance: Hard alloy overlay on gate and seat surfaces (e.g., Stellite 6) resists wear from abrasive media or high-velocity flow, extending service life in applications such as sewage systems or crude oil pipelines with minor sediment.

IV. Manufacturing Process

TIANYU adheres to stringent manufacturing protocols to ensure the quality and performance of its PN16 WCB flange gate valves:

Material Selection and Inspection: WCB cast steel raw materials undergo rigorous testing to verify compliance with ASTM A216 standards. Chemical composition analysis ensures carbon content (0.25-0.35%), manganese (0.60-1.00%), and silicon (0.15-0.40%) meet specifications, while mechanical testing confirms tensile strength (≥415MPa) and impact resistance (≥20J at -29℃). Valve stem materials (2Cr13) are checked for corrosion resistance and hardness (HB 197-255).
Precision Casting: Valve bodies and bonnets are produced using sand casting with resin-bonded sand molds, ensuring dimensional accuracy and minimizing internal defects (e.g., porosity, shrinkage). Castings undergo ultrasonic testing to detect hidden flaws, critical for pressure-containing components.
Machining of Key Components: Flange faces, stem holes, and seat surfaces are machined using CNC lathes and milling centers to maintain tight tolerances (±0.05mm). Flange sealing surfaces are finished to Ra 1.6μm to ensure proper gasket seating, while stem threads are precision-cut to ensure smooth engagement with the handwheel or actuator.
Sealing Surface Treatment: Gate and seat sealing surfaces are prepared via overlay welding of hard alloy (Stellite 6) using submerged arc welding. This process is followed by heat treatment (solution annealing) to enhance hardness (HRC 38-45) and prevent cracking, ensuring wear resistance during repeated operation.
Assembly and Calibration: The valve stem is assembled with the gate, ensuring perpendicular alignment to prevent binding during movement. Packing glands are torqued to specifications to balance sealing and stem mobility. Manual handwheels are calibrated for smooth rotation, with torque requirements tested to ensure operability across the valve’s service life.
Pressure Testing and Quality Control: Each valve undergoes comprehensive testing in accordance with API 598:
- Shell test: 1.5 times PN16 (2.4MPa) to verify the valve body and bonnet’s structural integrity, with no visible leakage or deformation.
- Seat test: 1.1 times PN16 (1.76MPa) to confirm tight shutoff, with zero leakage across the gate-seat interface.
- Operation test: Verification of smooth gate movement (full open to full close) and proper alignment of stem position indicators.

Valve Details

V. Product Advantages

TIANYU PN16 WCB cast steel flange gate valve offers numerous advantages that make it a preferred choice for industrial flow control:

Exceptional Durability: WCB cast steel’s high strength and impact resistance, combined with hard alloy-sealed surfaces, ensure the valve withstands cyclic operation, pressure fluctuations, and minor abrasion—extending service life to 10+ years in typical industrial environments.
Reliable Sealing Performance: The wedge gate design, enhanced by line pressure, delivers consistent shutoff even after thousands of operations, reducing the risk of media loss in critical systems (e.g., oil pipelines, gas distribution).
Installation Flexibility: Single and double flange options accommodate diverse pipeline configurations, from compact urban water networks (single flange) to high-stress industrial lines (double flange), simplifying integration into existing systems.
Broad Operational Versatility: Compatible with temperatures from -29℃ to 425℃ and media ranging from water to oil and gas, the valve eliminates the need for specialized valves in mixed-media facilities, reducing inventory complexity.
Cost-Effective Performance: WCB cast steel balances durability and cost, making the valve an economical choice for medium-pressure applications without sacrificing reliability. Low maintenance requirements (adjustable packing, replaceable seats) further reduce lifecycle costs.
Global Standard Compliance: Adherence to GB/T 12234, API 600, and EN 13709 ensures compatibility with international pipeline systems, facilitating integration into multinational projects and reducing regulatory barriers.
User-Friendly Operation: Multiple drive options (manual, electric, pneumatic) cater to different operational needs—manual for small valves, electric/pneumatic for large or automated systems—ensuring ease of use across scenarios.

Application

VI. Product Applications

TIANYU PN16 WCB cast steel flange gate valve is widely used across industries that require reliable on-off control in medium-pressure systems:

Municipal Water and Wastewater: Deployed in water supply mains, sewage treatment plants, and irrigation systems, where the valve’s bidirectional sealing and corrosion resistance (via paint coating) ensure long-term performance in aqueous environments.
Petroleum and Petrochemical: Used in crude oil gathering lines, refined product pipelines, and storage tank farms, where the hard alloy seals resist erosion from hydrocarbons and the WCB body withstands medium temperatures.
Power Generation: Integrated into low-pressure steam lines (boiler feedwater, condensate return) and cooling water circuits, leveraging the valve’s high-temperature tolerance and secure shutoff to maintain system efficiency.
Chemical Industry: Suitable for neutral or weakly corrosive fluid lines (e.g., solvent transfer, process water), with optional soft seals (PTFE) available for applications requiring enhanced chemical compatibility.
Metallurgy and Mining: Applied in industrial water systems, slurry pipelines (with minor solids), and fuel supply lines, where the valve’s robust construction resists vibration and abrasion from mining operations.
HVAC and Building Services: Used in large-scale heating and cooling pipelines, providing reliable on-off control for hot water or chilled water distribution in commercial buildings and industrial facilities.

TIANYU PN16 WCB cast steel gate valve, with DN15-DN600 sizes, single/double flanges, and -29℃~425℃ temp range, suits water, oil, gas. Its wedge design ensures tight sealing, WCB material offers durability. Ideal for municipal, petrochemical, power sectors. Customizable (drives, seals, sizes) to meet specific needs, backed by strict quality testing.