Self-reliance type classification and selection of points of the pneumatic control valve

Self-reliance type pneumatic control valve of the classification and selection of key points for type pneumatic control valve is made driving source, medium itself strength to drive the valve, to realize the automatic control of the pressure, flow, temperature, and this is a kind of valve that is energy saving, environmental protection, in the case of lack of air supply, power supply, has a very broad prospects for the use of. Pneumatic - valve main categories are self-reliance self-reliance type pressure pneumatic control valve, pneumatic control valve, self-reliance self-reliance type temperature type flow pneumatic control valve, nitrogen sealing device, self-reliance decay pneumatic pressure regulator, etc. Can self-reliance type pressure pneumatic control valve, control valve after pressure, also can control valve pressure before the applicable medium is water, steam, oil, gas and so on. Pressure pneumatic control valve for steam, need to apply pressure in the cylinder and pipe tube mounted between the cooling tank, filled them with cold water and steam is cooled after the condensing tank, will not cause damage to the cylinder diaphragm in the cylinder. Self-reliance type temperature pneumatic control valve has a bulb type and electric type, electric type sensors, adjusting device and pneumatic control valve integrated into an organic whole, can realize the accurate control of temperature, greatly saves the separation control of costs, and because of the bulb type sensor with silicone oil, according to the heat bilges cold shrink of silicone oil to produce power to drive the valve, such as electric control model, control precision in control precision is not strict, can choose self-help type temperature of the bulb type pneumatic control valve. Self-reliance type flow pneumatic control valve, the working principle of the pneumatic control valve and pressure, but the object is flow control. If the control valve pressure is lower, then need to choose to take command of self-reliance type pressure pneumatic control valve, which is nitrogen seal valve, nitrogen seal valves are generally and drain valve used in a variety of storage tank together, both the medium in the tank for nitrogen protection, also on the pressure of storage tank safety protection, when feeding tank, the tank pressure is reduced, to form a vacuum effect, at this point, the nitrogen filling nitrogen sealing valve; When feeding, the storage tank pressure increases, the extra nitrogen discharge nitrogen valve will row, in this way, tank won't be damaged because of the elevated tank pressure or vacuum. Main characteristics and application single-seat pneumatic - valve pneumatic control valve is mainly applied to allow the leakage is usually not a small pressure difference of the workplace. Sleeve type pneumatic control valve USES the balance valve core, the unbalanced force is big, allow the pressure difference is big, stable operation. Cage differential pressure of the pneumatic control valve is particularly suited to allow small and large pressure difference before and after the valve work situation. Two-seater pneumatic control valve, especially used in pressure difference is bigger and not strict with leak amount clean medium occasion.