Pressure Relief Valve 500X (3/4"-32")

500X relief/holding valves are mainly used in fire or other water supply systems to prevent overpressure or maintain fire water supply systems. The water hammer can be reduced after the fire pump is closed. Also used for water hammer devices in large water supply systems. And at the inlet of the valve control system is equipped with a clean strainer, the use of fluid properties, the proportion is larger and larger diameter of suspended particles can't access control systems, ensuring that the system circulation unobstructed, enables the valve to run safely and reliably. The system has stable movement, high strength and long service life.
The 500X relief/holding valve is composed of main valve, relief/pressure guide valve, ball valve, microform filter and pressure gauge. Hydraulic automatic operation can be used as pressure relief valve. When the valve is used, it can maintain the pressure of the water supply road under the set safe value; The pressure valve shall be used to maintain the upstream water pressure of the main valve above the set value and maintain the upstream water supply pressure of the main valve.
Working principle:
1, A pressure relief valve: when the pressure relief/holding pressure pilot valve is adjusted for pressure condition, water through the needle valve, the main valve control room, ball valve, A pressure relief/holding pressure pilot valve, ball valve B of exports, at this time the main valve is fully open. When the inlet pressure exceeds the safe value set by the relief/pressure guide valve, the relief guide valve will be opened automatically, with the ball valve C releasing some water to make the pipe leak pressure. The relief valve automatically shuts down when the pressure is restored to the safe value. As the relief valve, the ball valves always open.
2. As the holding valve: when the pressure/pressure guide valve is adjusted to the holding state, the guide valve shall be closed as long as the inlet water pressure of the main valve is lower than the guiding value of the guide valve. Main control room pressure, main valve closed. When the main valve upstream water supply pressure exceeds pilot valve set pressure, holding pressure pilot valve to open, the control room of water through the ball valve to the export, the control room main reducing valve open, began to water supply, that maintain the upstream water pressure. When holding pressure valve, ball valve C often closed or replaced with silk.

Main technical parameters:



Our company introduction:
Shanghai Qingjiang Valve Manufacturing Co, . Ltd. Is located in Shanghai Fengxian Industrial Zone, is a commitment to scientific research, production, sales of professional valve manufacturer. 
Company to an international metropolis -- Shanghai as the basis, make full use of regional advantages and industry, is committed to the introduction of international advanced management experience and technological innovation, and actively promote the enterprise comprehensive strength, and expand market share, formed with the gate valve, globe valve, ball valve, check valve, butterfly valve, hydraulic control valve, balance valve, relief valve, regulating valve and so on more than 60 series nearly 1000 varieties of products structure. Products nominal diameter is 1/4"-80" (DN6-2600mm) pressure 0.1MPa - 32.0MPa, temperature -196-595º C. Valve of the main materials are cast iron, ductile iron, carbon steel, alloy steel, stainless steel, copper and other materials, and according to the special needs of customers and manufacture of metal products. Widely used in construction, municipal, water supply and drainage, HVAC, fire, electricity, metallurgical, petrochemical, gas and other industries, and exported to the Middle East. Europe and the United States and Southeast Asia and other countries and regions. High quality wins the customer the consistent high praise and trust.