What should we pay attention to when installing pipeline valves? The use and working principle of self-operated pressure reducing valve

What should we pay attention to when installing pipeline valves? The use and working principle of self-operated pressure reducing valve

In the fluid piping system, the valve is the control element, its main role is to isolate the equipment and piping system, regulate the flow, prevent backflow, regulate and discharge pressure. It can be used to control the flow of air, water, steam, all kinds of corrosive media, mud, oil, liquid metal and radioactive media. Because the pipeline system to choose the right valve is very important, in the construction process, the quality of pipeline valve installation, directly affect the future normal operation, so must pay attention to.
Check items before installation
1. Carefully check whether the valve model and specification meet the requirements of the drawing.
2, check whether the stem and disc open flexibly, whether there is stuck and skew phenomenon.
3. Check whether the valve is damaged, and whether the thread of the valve is straight and intact.
4, check whether the combination of the valve seat and the valve body is firm, the valve disc and the valve seat, the valve cover and the valve body, the valve stem and the valve disc.
5. Check whether the valve padding, packing and fasteners (bolts) are suitable for the requirements of the nature of the working medium.
6, the old or used for a long time should be disassembled, dust, sand and other debris must be cleaned with water.
7, *** opening seal, check the sealing degree, the valve disc must be closed tightly.
Installation Requirements
1. The installation position of the valve should not interfere with the operation, disassembly and maintenance of the equipment, pipeline and valve body itself, and the appearance of the assembly should be taken into account.
2, the valve on the horizontal pipeline, the valve stem is installed upward, or tilted to a certain Angle, can not be installed down the hand wheel. The valve, stem and handwheel on the high altitude pipe can be installed horizontally, and the opening and closing of the valve can be remotely operated by the chain in the vertical low place.
3, symmetrical arrangement, neat and beautiful; For the valve on the riser, if the process permits, the handwheel of the valve should be operated at chest height, generally 1.01.2m from the ground, and the valve stem must be installed along the direction of the operator.
4, the valve on the side by side riser, the center line elevation is the best consistent, and the net distance between the handwheel is not less than 100mm; Valves on side-by-side horizontal lines should be staggered to reduce pipe spacing.
5. When installing heavy valves on water pumps, heat exchangers and other equipment, valve supports should be set up; When the valve is operated frequently and installed above 1.8m from the operating surface, a fixed operating platform should be provided.
6, the valve body has an arrow sign, the arrow pointing is the flow direction of the medium. When installing the valve, be careful that the arrow points in the same direction as the medium in the pipeline.
7. When installing flange valves, ensure that the end faces of the two flanges are parallel and concentric, and do not use double gaskets.
8. When installing threaded valves, a threaded valve should be equipped with a live connection for easy disassembly. The setting of the live connection should consider the convenience of maintenance, usually the water flow through the valve and then through the live connection.
The purpose and principle of self-reliance type pressure reducing valve Self-reliance type pressure reducing valve is a control valve open-close part of the opening in the body to adjust the flow of the medium, the medium pressure is reduced, at the same time with the aid of the role of the valve after pressure adjust the opening of open-close part, keep the valve after pressure within a certain range, under the condition of the inlet pressure changing, keep the outlet pressure within the scope of the set, Protect the subsequent household and production equipment.
Purpose and main performance: the valve is suitable for water, steam, air medium pipeline, by adjusting the inlet pressure to reduce to a required outlet pressure, when the inlet pressure and flow has changes, by the energy of the medium itself automatically maintain the outlet pressure within a certain range, but the inlet pressure and outlet pressure difference must be ¡Ý0.2MPA/CM
Working principle and structure: When the pressure reducing valve is delivered, Adjusting spring in uncompressed state, at this time the main valve disc and pay a disc in the closed state, when used according to clockwise to adjust screw, compression adjusting spring, make the membrane valve open move pay disc, medium by a hole by paying the seat to b holes into the piston above, the piston under the action of medium pressure, leaving the move down to promote the main valve seat valve, make the medium flow valve. By c below the hole into the diaphragm at the same time, when the valve after pressure set more than pressure, push the diaphragm up regulating spring compression, pay the disc to close the direction, then reduce flow into the piston at the top of the medium, pressure drops, also at this time the main valve disc on the main valve disc spring force to push down, the clearance of the main valve disc and the main seat is reduced, the medium flow also is less, the valve after pressure The force also drops to the new balance, on the contrary, when the pressure after the valve is lower than the set pressure, the gap between the main valve disc and the main valve seat increases, the medium flow also increases, so that the pressure after the valve also increases to reach a new balance.
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