Fujian pressure relief valve, holding pressure valve, 500X, pressure relief holding valve selection quotation technical support service

The pressure relief valve / holding valve consists of a main valve, a pressure relief / holding pilot valve, a ball valve, a micro-filter and a pressure gauge. Use hydraulic automatic operation, which can be used as pressure relief valve and holding pressure valve. When used as a pressure relief valve, the pressure of the water supply channel can be maintained below a set safe value; as a holding valve, it can maintain the water pressure upstream of the main valve above the set value and maintain the water supply pressure upstream of the main valve. 1. As a pressure relief valve: When the pressure relief / hold pressure pilot valve is adjusted to a pressure relief state, water flows to the outlet through the needle valve, main valve control room, ball valve A, pressure relief / hold pressure 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 / hold pressure pilot valve, the pressure relief pilot valve will automatically open, and some water will be discharged through the ball valve C to release the pressure in the pipeline. When the pressure returns to a safe value, the pressure relief valve closes automatically. When used as pressure relief valve, each ball valve is always open. 2. As a holding valve: When the pressure relief / holding pilot valve is adjusted to a holding state, as long as the inlet water pressure of the main valve is lower than the set value of the pilot valve, the pilot valve is closed. The main control room is boosted and the main valve is closed. When the water supply pressure upstream of the main valve exceeds the set pressure of the pilot valve, the pressure-holding pilot valve can be opened, and the water in the control room is discharged to the outlet through the ball valve. When used as a pressure-holding valve, the ball valve C is normally closed or replaced with a wire plug.