Technical Parameters

Product model: 500X

Nominal diameter: DN50~1000mm

Nominal pressure: PN1.0~2.5MPa

Applicable medium: water, oil, sea water, sewage

Applicable temperature: 0~80℃

Structure length standard: GB/T12221-2005

Connection flange standard: GB/T9113

Pressure temperature grade: GB/T12224-2005

Test inspection standard: GB/T13927-2008

Product overview

The 500X pressure relief/pressure sustaining valve is composed of a main valve, a pressure relief/pressure sustaining pilot valve needle valve, a ball valve, a micro filter and a pressure gauge to form a hydraulic control takeover system. Using hydraulic automatic operation, it can be used as a pressure relief valve and a pressure sustaining valve. When used as a pressure relief valve, it can maintain the water supply pressure below the set safety value; when used as a pressure sustaining valve, it can 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. As a pressure relief valve: when the pressure relief/pressure sustaining pilot valve is adjusted to the pressure relief state, the water flows to the outlet through the needle valve, the main valve control room, the ball valve A, the pressure relief/pressure sustaining pilot valve, and the ball valve B. The main valve is open. When the inlet pressure exceeds the safety value set by the pressure relief/pressure sustaining pilot valve, the pressure relief pilot valve will automatically open, and part of the water will be released through the ball valve C to relieve the pipeline pressure. When the pressure returns to a safe value, the pressure relief valve closes automatically. When used as a pressure relief valve, each ball valve is normally open.

2. As a pressure sustaining valve: when the pressure relief/pressure sustaining pilot valve is adjusted to the pressure sustaining 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 will be closed. The main control room is boosted and the main valve is closed. When the upstream water supply pressure of the main valve exceeds the set pressure of the pilot valve, the pressure-sustaining pilot valve can be opened, the water in the control room is discharged to the outlet through the ball valve, the pressure-reducing main valve of the control room is opened, and the water supply starts, that is, the upstream water pressure is maintained. When used as a pressure sustaining valve, the ball valve C is normally closed or replaced with a plug.

The main technical parameters

Main part material

Connection size