The gas pressure regulating valve is a lever type differential pressure feedback control pressure regulating. The gas in the gas cylinder is liquid, the pressure is too high, and it must be decompressed to be suitable for burning the stove. If the gas pressure regulating valve is broken, it must be replaced. Consequence 1, no gas; consequences 2, no decompression.
Without decompression, it is easy to cause the hose to fall off and leak gas, and the consequences are unimaginable. Principle of decompression: The high-pressure medium is charged into a relatively large cavity through a small hole to achieve decompression, which is actually decompressed by interception. The two sides of the diaphragm or piston are out of the mouth, one side is the artificial pressure, and the valve stem that controls the size of the small hole is connected with the diaphragm (piston).
working principle
The pressure regulating valve can basically be said to be a pressure reducing valve. The working principle of the pressure reducing valve is as follows: the high pressure medium is charged into a relatively large cavity through a small hole to realize the decompression, and actually relies on the decompression and decompression, the diaphragm or the piston. The two sides are out of the mouth, one side is the artificial pressure, and the valve stem that controls the size of the small hole is connected with the diaphragm (piston), so that as long as a fixed pressure is given, the pressure of the oral cavity will always be equal to this pressure. This assumes that a given pressure can be provided by a spring or a source of air or a hydraulic source.
effect
What is the filter regulator used for? Decompression. The pneumatic valve positioner is designed according to the principle of force balance. Its working principle is designed and operated according to the principle of force balance. When the signal pressure of the bellows is increased, the lever 2 is rotated around the fulcrum, the baffle is close to the Nozzle, the nozzle back pressure is amplified by the amplifier, and then sent to the film actuator air chamber to move the valve stem downward and drive the feedback rod The (pendulum rod) rotates around the fulcrum, and the feedback cam (eccentric cam) connected to the same shaft also rotates counterclockwise, the lever 1 is rotated about the fulcrum by the roller, and the feedback spring is stretched, and the spring pulls the lever 2 When the force acting on the bellows with the signal pressure reaches the moment balance, the meter reaches equilibrium. At this point, a certain signal pressure corresponds to a certain valve position. The above action mode is a positive action. If the action mode is to be changed, the cam is turned over and the A direction is changed to the B direction.
The so-called positive acting positioner means that the signal pressure increases and the output pressure also increases. The so-called reaction positioner means that the signal pressure increases and the output pressure decreases. A positive acting actuator can implement the action of the reaction actuator as long as the reaction locator is installed; on the contrary, a reaction actuator can implement the action of the positive acting actuator as long as the reaction locator is installed. Related Website (with photos) The regulating valve is usually composed of an electric actuator or a pneumatic actuator and a valve body. Straight strokes mainly include straight-through single-seat and straight-through two-seat. The latter has the characteristics of large circulation capacity, unbalanced operation and stable operation, so it is usually suitable for occasions with large flow, high pressure drop and low leakage. The angular stroke mainly includes: V-type electric adjustment ball valve, electric butterfly valve, ventilation control valve, eccentric butterfly valve and the like.
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