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Gate Valve

Gate Valve

Working Principle: The valve stem drives the gate to move vertically up and down. When the gate is fully raised, the pipeline is straight and flow is unimpeded; when the gate falls, it presses against the valve seat, blocking the flow of media.

The media can flow in both directions without directional restrictions, and there are no flow direction requirements during installation.
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Product Description

Main Structural Classifications

 

1. By Gate Type

• Wedge Gate Valve: Single gate with wedge seal, excellent sealing performance, resistant to high temperature and pressure, most commonly used.

• Parallel Double Gate Valve: Suitable for low-pressure, normal-temperature water and steam media, wear-resistant and durable.

2. By Stem Structure

• Rising Stem Gate Valve: Exposed stem for easy identification of opening and closing status, corrosion-resistant and long service life.

• Non-exposed Stem Gate Valve: Stem not exposed, small footprint, mostly used for water supply and drainage, and underground pipelines.

3. Sealing Type

• Hard Seal: Metal seal, resistant to high temperature and pressure, wear-resistant, suitable for steam, oil, and high-temperature conditions.

• Soft Seal: Rubber/PTFE seal, zero leakage, corrosion-resistant, mostly used for sewage and tap water.

 

Core Advantages

 

1. Minimal flow resistance, straight internal passage without bends, low energy consumption for media transport;

2. Bidirectional sealing, usable in both forward and reverse flow directions, easy installation;

3. No media erosion of the sealing surface when fully open, long service life of the sealing surface;

4. Simple structure, low failure rate, easy maintenance, and wide range of applicable diameters.

 

Common Materials and Parameters

 

• Valve Body: Cast iron, ductile iron, WCB carbon steel, 304/316L stainless steel

• Pressure: PN10, PN16, PN25, PN40; Class 150~300

• Temperature: Soft seal ≤120℃, hard seal up to 425℃+

• Connection Methods: Flange, threaded, welded, wafer

 

Applicable Operating Conditions
Suitable for pipeline switching of pure, particulate-free media:

• Municipal water supply and drainage, fire protection, tap water projects

• Power plant steam, heating networks, oil and gas transmission

• Petrochemical, HVAC, compressed air, clean water, oil pipelines

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Related Products

Disc Check Valve

Disc Check Valve

Main Parameters

• Nominal Pressure: PN10～PN40

• Nominal Diameter: DN50～DN1200, with significant advantages for large diameters

• Operating Temperature: -20℃～+200℃, adaptable to high and low temperature conditions depending on the sealing material

• Connection Method: Flange, Wafer, Double Flange, strong installation adaptability

• Sealing Form: Rubber soft seal, metal hard seal, tight seal, sensitive opening and closing

Structural Forms

1. Wafer Butterfly Check Valve: Lightweight and low cost, installed between two flanges, occupying little space.

2. Double-Disc Butterfly Check Valve: Symmetrical structure with double valve plates, smooth opening and closing, low water hammer, suitable for high flow pipelines.

3. Single-Disc Butterfly Check Valve: Simple structure, good flow performance, suitable for conventional water supply and drainage, and industrial pipelines.

Check Valve

Check Valve

Working Principle: When the medium flows in the forward direction, the fluid pressure opens the valve disc/valve core, allowing the valve to open. When the medium flows in the reverse direction or the pressure reverses, the valve automatically closes and seals itself due to its own weight and the pressure of the reverse medium, completely blocking backflow without manual or electrical control.

Main Classifications and Structures:
1. Swing Check Valve: The valve disc swings around a pin. Commonly used in large-diameter applications, it has low flow resistance and smooth passage, suitable for water, steam, and oil.

2. Lift Check Valve: The valve disc moves vertically up and down along the valve stem, providing better sealing performance. Often used in small-diameter, high-pressure applications.

3. Wafer Check Valve: Ultra-thin structure, small size, low cost. It is clamped between two flanges for easy installation.

4. Butterfly Double-Disc Check Valve: Double-disc structure, sensitive opening and closing, good buffering, suitable for large-diameter water supply and drainage, and industrial pipelines.

5. Silent Check Valve: With a buffer structure, it reduces water hammer and noise. Commonly used in buildings and pump rooms.

Fluorine-Lined Check Valve

Fluorine-Lined Check Valve

Main Performance Parameters

• Nominal Pressure: PN6～PN25

• Nominal Diameter: DN15～DN300

• Operating Temperature: -50℃～+150℃ (depending on lining material; PFA and TFM modified fluoropolymer linings can withstand temperatures up to 260℃)

• Sealing Class: Class VI, extremely leak-proof

• Applicable Media: Strong acids, strong alkalis, strong oxidizers, organic solvents, hydrofluoric acid, aqua regia, and other highly corrosive media

Structural Forms

1. Lift Type (H41F46): Compact structure, excellent sealing performance, moderate flow resistance, suitable for horizontal pipelines.

2. Swing Type (H44F46): Single-plate structure, large diameter, low flow resistance, suitable for high-flow, large-diameter pipelines.

3. Vertical Type (H42F46): Adapted for vertically upward-installed pipelines, unidirectional backflow prevention, dedicated to vertical operating conditions.

Fluorine-Lined Gate Valve

Fluorine-Lined Gate Valve

Working Principle:
The valve stem drives the gate to rise and fall vertically, controlling the flow of the pipeline; the medium only contacts the fluoroplastic lining layer and does not directly contact the metal valve body, completely isolating it from acid and alkali corrosion; it allows bidirectional flow without flow direction restriction, and is only used for switching off, not for throttling or regulating.

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+86 19858780995

+86 19858780995

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