The Piston Safety Pressure Release Holding Pressure Valve is primarily used in fire protection or other water supply systems to prevent system overpressure or maintain pressure in fire protection water supply systems. It can also reduce water hammer impact after the fire pump is shut down. It is also used as a water hammer elimination device in large water supply systems. Furthermore, a self-cleaning filter is installed at the inlet of the valve control system, utilizing fluid characteristics to prevent heavier, larger-diameter suspended particles from entering the control system, ensuring unobstructed system circulation and safe and reliable valve operation. The system operates smoothly, has high strength, and a long service life, suitable for pipelines with diameters up to 600 mm.
Working Principle
As a pressure relief valve: When the pressure relief/sustaining pilot valve is adjusted to the pressure relief state, water flows to the outlet through the needle valve, main valve control chamber, ball valve A, pressure relief/sustaining pilot valve, and ball valve B. At this time, the main valve is open. When the inlet pressure exceeds the safety value set by the pressure relief/sustaining pilot valve, the pressure relief pilot valve will automatically open, releasing some water through ball valve C to relieve pressure in the pipeline. When the pressure returns to the safety value, the pressure relief valve will automatically close. When acting as a pressure relief valve, all ball valves are normally open.
As a pressure sustaining valve: When the pressure relief/sustaining pilot valve is adjusted to the pressure sustaining state, the pilot valve will close as long as the main valve inlet water pressure is lower than the pilot valve's set value. The main control chamber is pressurized, and the main valve closes. When the upstream water supply pressure of the main valve exceeds the pilot valve's set pressure, the pressure sustaining pilot valve can open. Water in the control chamber is discharged to the outlet through the ball valve, the control chamber depressurizes, the main valve opens, and water supply begins, thus maintaining the upstream water pressure. When used as a pressure sustaining valve, ball valve C is normally closed or replaced with a plug.
Advantages and Disadvantages of Piston-Type Pressure Sustaining and Relief Valves
Piston-type pressure sustaining and relief valves have the following advantages:
1. They can maintain stable pressure in the system, thus protecting equipment from damage caused by excessive pressure and flow.
2. They can control the flow rate and direction of liquid to meet different operating requirements.
3. They have a simple structure and are easy to maintain.
Disadvantages of piston-type pressure sustaining and relief valves are:
1. They can only operate within a certain pressure range and cannot handle pressures exceeding that range.
2. They are not suitable for high-viscosity liquids.
Piston Safety Pressure Release Holding Pressure Valve Factory
