Self-reliance type of pneumatic control valve and classification

Self-reliance type pneumatic control valve, as the name implies, is ability oneself give oneself force to complete the adjustment and control of a valve, it is because of this feature, so the valve industry greatly sought after and loved, application is very wide, just as the below small make up take a look at self-help type of pneumatic control valve and classification! Self-reliance type pneumatic control valve is a kind of without external energy, rely on their own measured medium, pressure or temperature or flow rate according to the preset values, to automatically adjust the control device, is a kind of energy-saving instrument. It integrates control, perform many functions in one. Become an independent instrument control system. Set of transmitter, the function of the controller and actuator at an organic whole. Different from general meaning on the control valve. Pneumatic - valve with self-reliance self-reliance type pressure ( Micro pressure) Pneumatic control valve, self-reliance, Differential pressure) Flow pneumatic control valve, self-reliance type temperature pneumatic control valve and other categories. Self-reliance type pressure pneumatic control valve is a member of the family, because it does not need external energy, product structure is simple, easy to use, less maintenance workload, especially suitable for the urban heating, heating and no power supply, gas supply and need control occasions. Self-reliance type pressure pneumatic control valve of self-reliance type pressure valve pneumatic control valve is self-contained pressure controller. In general, medium pressure changes with the change of the medium flow. When the flow of the medium changes, in order to ensure the pressure constant, requires self-reliance type pneumatic - valve to control. Self-reliance type pressure pneumatic control valve is composed of three elements, respectively is: 1. Current limiting element: valve, etc. ; 2. Measurement elements: pressure gauges, diaphragm, piston, etc. ; 3. Load elements: spring, weights, manpower, etc. The classification of self-reliance type pressure pneumatic - valve 1. After press valve, the valve before control is divided into: self-reliance type valve (after The reduced pressure) Control valve, valve (before Pressure relief) Control valve. 2. According to whether or not to bring a command unit is divided into: direct action and operational command device self-reliance type pneumatic control valve a. Direct effects on type pneumatic control valve direct acting pressure regulating valve valve is controlled directly by the medium itself, reach the role of regulating. Direct acting pressure regulating valve has a valve after pressure form and take pressure before valves. Valve after pressure, keep the valve after pressure within the scope of the set, can reach the effect of valve after decompression. Before valve before the valve pressure, pressure in the set range, to achieve the effect of pressure relief valve before. b。 The operating type of self-help type of command to the operating type pneumatic control valve of pneumatic control valve command is controlled by the interaction between the two valves, to achieve automatic regulating role. The difference between the self-reliance type pressure pneumatic control valve and control valve, the difference between the two types of product mainly control valve needs both external energy ( Such as electricity or gas) Can do drive, also need to accept foreign control instrument signal to change intercepting a relative position in the valve, so as to realize change fluid flow. And self-reliance type pressure pneumatic - valve does not need external energy, and do not need to accept the foreign control instrument signal, only on the pressure signal of modulated medium, can realize the pressure regulation.