Design and Selection Points of Adjustable Pressure Reducing Valve
date:2024-03-19 08:46
Design and Selection Points of Adjustable Pressure Reducing Valve
(1) The adjustable pressure reducing valve used in engineering is a product that has been inspected and qualified, with complete identification and technical data that meets the requirements.
(2) According to functional requirements, select the type of valve, and then determine the material of the valve body and sealing parts of the valve based on the medium transported by the pipeline, temperature, building standards, and owner requirements. Common valve body materials include cast iron, copper iron, copper, plastic, etc. Common sealing surfaces and lining materials include copper alloy, plastic, steel, hard alloy, rubber, etc. The valve body material should match the pipeline material.
(3) The nominal pressure of valves is different levels such as 0.6, 1.0, 1.6, 2.5, and 4.0 MPa. The working pressure of the medium transported by pipelines should be less than the nominal pressure value of the valve.
(4) The setting of hydraulic control valves in engineering should have sufficient space for management, operation, installation, and maintenance, and should meet the requirements of pipelines for valves.
(5) When the pipeline adopts flange connection, hydraulic control valves with flange connection should be used; When using groove type connections for pipelines, hydraulic control valves with groove type connections should be used.
(6) The piston type adjustable pressure reducing valve should be installed on a pipeline with unidirectional flow of medium.
(7) The arrow direction on the main valve body of the piston type adjustable pressure reducing valve must be consistent with the flow direction of the pipeline system.
(8) There should be no air blockage or air resistance in the section connecting the hydraulic control valve. Automatic exhaust valves should be installed in the gas storage section of the pipeline network ≤ position.
When the valve is installed horizontally, the valve cover and valve stem should face upwards. When installed vertically, the valve cover and valve stem should face outward.
(10) Strength and tightness tests should be conducted before valve installation.
(11) The strength and tightness test of the valve should comply with the following regulations.
A. The strength test pressure of the valve is 1.5 times the nominal pressure;
B. The tightness test pressure of the valve is 1.5 times the nominal pressure;
C. The test pressure should remain unchanged during the test duration, and there should be no leakage on the shell packing and valve disc sealing surface;
D. The duration of valve testing shall be as shown in the table above.
