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(1) The hydraulic control valve used in the engineering type is a product that has passed the inspection of the manufacturer and has various complete markings and technical data meeting the requirements.
(2) According to the functional requirements, select the type of valve, and then determine the material of the valve body and sealing part of the valve according to the pipeline medium, temperature, building standards and main requirements of the industry. Commonly used valve body materials are cast iron, copper iron, copper, plastic and so on. Commonly used sealing surfaces and lining materials are copper alloy, plastic, steel, hard alloy, rubber and the like. The body material should match the material of the pipe.
(3) The nominal pressure of the valve has different levels such as 0.6, 1.0, 1.6, 2.5 and 4.0 MPa. The working medium of the pipeline should be less than the nominal pressure of the valve.
(4) The setting of the water control valve in the project should have sufficient space for management, operation, installation and maintenance, and should meet the requirements of the pipeline for the valve.
(5) When the pipeline is flanged, the flanged hydraulic control valve should be used; when the pipeline is grooved, the grooved hydraulic control valve should be used.
(6) The water control valve should be placed on the pipeline in which the medium flows in one direction.
(7) the direction of the arrow on the main valve body water control valve must be consistent with the flow conduit system.
(8) There should be no air blockage or air resistance in the pipe section of the hydraulic control valve. An automatic exhaust valve shall be provided in the gas storage section such as the pipe network Zui high position.
(9) When the valve is installed horizontally, the valve cover and valve stem should face upward. When installed vertically, the bonnet and stem should face outward.
(10) The strength and tightness test should be done before the valve is installed.
(11) The strength and tightness test of the valve shall comply with the following requirements.
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 of the nominal pressure;
C. The test pressure shall remain unchanged for the duration of the test, and there shall be no leakage of the shell packing and the valve sealing surface;
D. The valve test duration is as shown in the above table.
Key points for design of water control valve
When the water tank (box) of the living, production and fire water supply system has a nominal diameter of 50 mm or more, the remote control float valve should be installed. The nominal diameter of the remote control float should be the same as the nominal diameter of the pipe. A filter should be provided before the remote control float valve. The filter should meet the following requirements: