Application of hydraulic control valve in building water supply engineering

Oct 12,2021

The hydraulic control valve is a combination of a main valve and its external needle valve and pilot valve. Hydraulic control valve is a general term for a series of multi-purpose control and similar valves. Their main features are: They use the medium's own pressure and hydraulic system operation in the mode of action, and can be automatically controlled, with accurate action and performance, and can be widely used in life production and fire water supply system pipelines to control and function.
However, there are still misunderstandings in the application of hydraulic control valves in engineering, such as valve application conditions, valve design and selection requirements, installation points, etc. For this reason, this article intends to use the CECS standard "Hydraulic Control Valve Application Design Regulations" (draft for review) ) As a basis, combined with my own experience to explain the above-mentioned aspects of the problem.
1. Key points for design and selection of hydraulic control valve:
1) The hydraulic control valve used in engineering is a product that has passed the inspection of the manufacturer, and has various marks and technical data that meet 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 according to the pipeline transportation medium, temperature, construction standards and main requirements of the industry. Commonly used valve body materials are cast iron, copper iron, copper, plastics and so on. Commonly used sealing surface and lining materials are copper alloy, plastic, steel, cemented carbide, rubber, etc. The valve body material should match the pipe material.
3) The nominal pressure of the valve has different levels such as 0.6, 1.0, 1.6, 2.5 and 4.0MPa. The working pressure of the medium transported by the pipeline should be less than the nominal pressure of the valve.
4) The installation of hydraulic control valves in the project should have enough space for management, operation, installation and maintenance, and should meet the requirements of pipelines for valves.
5) When the pipeline adopts flange connection, the flange connection hydraulic control valve should be adopted; when the pipeline adopts the groove connection, the groove connection hydraulic control valve should be adopted.
6) The hydraulic control valve should be installed on the pipeline where the medium flows in one direction.
7) The direction of the arrow on the main valve body of the hydraulic control valve is consistent with the flow direction of the pipeline system.
8) There should be no air blockage or air resistance in the pipe section connected to the hydraulic control valve. Automatic exhaust valves should be installed in the high positions of the pipe network and other gas storage sections.
9) 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 outwards.
10) The strength and tightness test should be done before the valve is installed.
11) The strength and tightness test of the valve should meet 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 the nominal pressure;
C. The test pressure should remain unchanged for the duration of the test, and the shell packing and valve clack should be sealed There is no leakage on the surface;
D. The duration of the valve test is in accordance with the above table.

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