Self operated pressure reducing valve

Self operated pressure reducing valve, also known as piston pressure reducing valve or steam pressure reducing valve. It is an essential accessory for pneumatic control valves, mainly used to reduce the pressure of the air source and stabilize it to a constant value, so that the control valve can obtain stable air source power for regulation and control. This type of valve should generally be installed horizontally in pipelines. According to the structural form, it can be divided into diaphragm type, spring film type, piston type, lever type, and bellows type; According to the number of valve seats, it can be divided into single seat and double seat types; According to the position of the valve disc, it can be divided into positive action type and reverse action type. The operation of a self operated pressure reducing valve is controlled by the pressure behind the valve. When the pressure sensor detects an increase in valve pressure indication, the opening of the pressure reducing valve decreases; When the pressure decreases after detecting the pressure reducing valve, the opening of the pressure reducing valve increases to meet the control requirements. Self operated pressure reducing valve - The pressure reduction ratio of this valve must be higher than the system value to a certain extent; It should be able to respond to positive or negative control signals even at maximum or minimum flow rates. These valves should be selected for the effective control range, which is 20% to 80% of the maximum flow rate. Normally, it is a proportional type or has proportional characteristics. These types of valves themselves have the optimal flow characteristics and flow range required for proportional control.
Self operated pressure reducing valve is a pressure reducing product that does not require any external energy and uses the regulated medium to regulate itself. The biggest feature of this product is that it can work in places without electricity or gas, while saving energy. The pressure setting value can be adjusted freely during operation. It adopts the characteristics of fast opening flow rate, sensitive action, and good sealing performance, so it is widely used in various industrial equipment such as petroleum, chemical, power, metallurgy, food, textile, machinery manufacturing, and residential buildings for pressure reduction and stabilization of various gas, liquid, and steam media.
Self operated pressure reducing valve is a pressure reducing product that does not require any external energy and is regulated by the medium itself. The biggest feature of this product is that it can work in places without electricity or gas, while also saving energy. The pressure setting value can be adjusted freely during operation. Adopting fast opening flow characteristics, the action is sensitive, and the sealing performance is good.
(1) External detection of pressure behind the valve;
(2) Pressure can be adjusted freely during operation;
(3) Fast opening flow characteristics, responsive action;
(4) Compact structure;
(5) Using stainless steel corrugated pipes to balance pressure;
(6) The valve head and valve seat are sealed by a conical surface;
(7) The valve stem is sealed with stainless steel bellows;
(8) Easy replacement of springs and actuators;
(9) No pillar design, more convenient to set up;
(10) Screw type valve seat can be independently replaced;
(11) Three types of springs are interchangeable;
(12) Five models of actuators are interchangeable;
(13) Convenient and accurate setting

According to the mode of action: direct action and commander action;
According to the pressure tapping method: pressure reducing regulator and back pressure relief regulator.
It can also be divided into pilot piston pressure reducing valve, diaphragm pressure reducing valve, bellows pressure reducing valve, proportional pressure reducing valve, self operated pressure reducing valve, direct acting self operated pressure reducing valve, back pressure regulating valve, etc. They are suitable for different working media.
Different forms have different specific working principles. But the overall principle is still: the pressure reducing valve reduces the inlet pressure to a certain required outlet pressure through throttling of the opening and closing components, and keeps the outlet pressure stable. But generally, pressure reducing valves require a pressure difference of ≥ 0.2Mpa between the inlet and outlet.
The main principle is the lever, which uses the pressure inside the valve to control the opening of the valve. The simplest thing is the pressure reducing valve on the gas tank at home. If you take it apart and look at it, everything will be clear. Anyway, it can still be used after disassembly and installation.
It is an energy-saving product that uses the pressure changes of the medium itself for self-control to maintain the constant pressure difference of the medium flowing through the controlled system. Now, taking the pressure difference control valve of the self operated pressure reducing valve installed on the return water pipeline as an example, the working principle is explained. When the water supply pressure P1 increases or decreases, the signal is transmitted from the connecting pipe to the upper chamber of the diaphragm, which drives the valve core to move downwards or upwards, reducing or increasing the flow area of the valve seat. P2-P3 also increases or decreases until P1-P2 maintains its original value constant. At the moment when the return water pressure P3 increases or decreases, the flow velocity towards the outlet of the valve seat decreases or increases, and the pressure P2 under the diaphragm also increases or decreases at this moment, driving the valve core to move up or down until the force on the diaphragm is re balanced, P2 returns to its original value, and P1-P2 protects the original value constant, thereby ensuring that the pressure difference between the supply and return water of the controlled system remains basically unchanged.
This valve is suitable for water, steam, and air medium pipelines. By adjusting the inlet pressure to a certain required outlet pressure, when the inlet pressure and flow rate change, the outlet pressure is automatically maintained within a certain range by the energy of the medium itself, but the difference between the inlet pressure and the outlet pressure must be ≥ 0.2MPA/CM.