Low Pressure Gate Valve

It is a shut-off valve used in low-pressure piping systems. It regulates the flow of the medium by vertically lifting the gate (valve disc). Due to its simple structure, low flow resistance, and reliable sealing, it is widely used in low-pressure pipeline systems of water, steam, oil, and other media.

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Product Details

1. Structure and composition
Low pressure gate valves are mainly composed of the following components:

1. Valve body

● Usually made of cast iron (HT200, QT450), cast steel (WCB) or bronze, suitable for low pressure conditions (usually ≤PN16).

2. Gate valve (valve disc)

● Divided into rigid gate valves and elastic gate valves:

● Rigid gate valves: suitable for clean media, slightly poor sealing.

● Elastic gate valves: with elastic compensation structure, better sealing, suitable for slightly grainy media.

3. Valve stem

● Divided into open rods (lifting type) and hidden rods (non-lifting type):

● Open stem: The valve stem rises and falls together with the gate valve, which is convenient for monitoring the condition of the valve and suitable for ground operation.

● Concealed stem: The valve stem does not rise or lower, suitable for space-constrained occasions.

4. Sealing material

● Valve seat seals are usually made of rubber, copper alloy, PTFE, etc., suitable for a variety of environments.

5. Control Mode

● Manual (handwheel, reducer), electric, pneumatic, etc. Low-pressure gate valves are usually operated by a handwheel.

2. Principle of operation
● Opening: Turning the handwheel, the valve stem drives the gate valve to lift, allowing the medium to flow.

● Closing: Turning the handwheel in the opposite direction, the gate valve is lowered, fits snugly against the valve seat, and cuts off the medium.

3. Main characteristics
✅ Low flow resistance: The flow channel is straight when fully opened, and the pressure loss is low.
✅ Good seal: The gate valve fits snugly against the valve seat, and the leakage rate is low.
✅ Wide range of applicable media: Can be used for water, steam, oil, gas, etc.

4. Areas of application
● Water supply and drainage systems: tap water, wastewater treatment.

● Heating, ventilation and air conditioning (HVAC): low-pressure steam, hot water piping.

● Petrochemicals: transportation of low-pressure oil, gas.

● Energy: Cooling water system

● Shipbuilding: seawater pipelines, fuels.