Working principle of steam pressure reducing valve

by:Lianke Valve     2022-07-22
The steam pressure reducing valve adjusts the flow rate of the medium by controlling the opening degree of the opening and closing parts in the valve body, reduces the pressure of the medium, and at the same time adjusts the opening degree of the opening and closing parts with the help of the pressure behind the valve to keep the pressure behind the valve at a certain value. Within the range, under the condition that the inlet pressure is constantly changing, keep the outlet pressure within the set range to protect the subsequent living and production equipment. The steam pressure reducing valve reduces the inlet pressure to a certain required outlet pressure through the throttling of the opening and closing parts, and keeps the outlet pressure stable. When the steam pressure reducing valve leaves the factory, the adjusting spring is in an uncompressed state. At this time, the main valve disc and the auxiliary valve disc are in a closed state. When in use, turn the adjusting screw clockwise to compress the adjusting spring, so that the diaphragm is moved to the top to open the auxiliary valve disc. The medium enters above the piston from the a hole through the auxiliary valve seat to the b hole. Under the action of the medium pressure, the piston moves down to push the main valve disc away from the main valve seat, so that the medium flows to the back of the valve. At the same time, it enters the bottom of the diaphragm from the c hole. When the pressure behind the valve exceeds the set pressure, the diaphragm is pushed up to compress the adjusting spring, and the auxiliary valve flap moves in the closing direction, so that the medium flowing into the top of the piston is reduced, and the pressure also increases with the pressure. At this time, the main valve disc is pushed up and down by the spring force of the main valve disc, so that the gap between the main valve disc and the main valve seat is reduced, the flow of the medium is also reduced, and the pressure after the valve is also reduced 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 achieve a new balance. The steam pressure reducing valve should generally be installed horizontally in the pipeline. The steam pressure reducing valve is an essential accessory of the pneumatic control valve. Its main function is to reduce the pressure of the air source and stabilize it to a fixed value, so that the control valve can obtain a stable air source power for adjustment and control. The work of the steam pressure reducing valve is controlled by the pressure behind the valve. When the pressure sensor detects that the valve pressure indication increases, the valve opening of the pressure reducing valve decreases; when the pressure reducing valve is detected, the opening of the pressure reducing valve increases to meet the control requirements. Steam pressure reducing valve - The pressure reduction ratio of this valve must be somewhat higher than the system value; it should be able to respond to a direct-acting or reverse-acting control signal even at maximum or minimum flow. These valves should be selected for the useful control range, ie 20% to 80% of the maximum flow. Normally, it is of equal proportion or has equal properties. These types of valves inherently have the optimum flow characteristics and flow ranges required for proportional control. The steam pressure reducing valve is suitable for water, steam and air medium pipelines. Through adjustment, the inlet pressure can be reduced to a required outlet pressure. When the inlet pressure and flow rate change, the energy of the medium itself automatically maintains the outlet pressure within a certain range. However, the difference between the inlet pressure and the outlet pressure must be greater than or equal to 0.2MPA/CM. Precautions for installation and use of the steam pressure reducing valve: Y43H-40 is equipped with 1~1.6MPa, 1.6~2.5MPa adjusting spring, Y43H-64 is equipped with 1~3MPa adjusting spring, the valve is equipped with 0.1~1MPa spring, the rest are attached with the valve, the user can choose according to the requirements Quantity of outlet pressure value is optional. The piping system must be flushed and cleaned before installing the steam pressure reducing valve. In order to prevent welding slag, oxide skin and other stolen goods from flowing into the valve, affecting the normal operation of the valve. The steam pressure reducing valve should be installed in a place that is easy to operate and maintain, and must be installed upright on the horizontal pipeline. Pay attention to make the flow direction of the medium in the pipeline consistent with the direction shown by the arrow on the valve body, and do not install it in reverse. When the pressure reducing valve is installed and used, the shut-off valve of the bypass pipeline should be opened to remove the mixture of condensed water and soda water in the pipeline, so as to prevent the occurrence of water and garbage when the pressure reducing valve is opened and damage the pressure reducing valve. When there is no abnormal phenomenon Then, slowly rotate the adjusting screw clockwise to adjust the outlet pressure to the required pressure (subject to the gauge pressure behind the valve). After adjustment, back-tighten the lock nut and screw on the protective cover. A filter should be installed before the pressure reducing valve to prevent debris in the medium from entering the pressure reducing valve and affecting its performance. There should be a straight pipe before and after the installed pressure reducing valve. The length of the straight pipe before the valve is about 600 mm, and the length of the straight pipe after the valve is about 1000 mm.
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