Three pneumatic valve pneumatic _ (confluence shunt) three valve

1, three pneumatic valve is the execution unit automation control system and instrument, electro pneumatic valve positioner, the electrical signal and compressed air as power control system, accept input 0-10mA DC or 4-20mA DC current signal by the regulator will be converted into the compressed air, the air pressure signal input and output can be realized. Split range control (section so as to change the amplitude of the signal), valve opening displacement, achieve process parameters on the fluid medium precision control

2, pneumatic three pass control valve according to the function mode can be divided;

Positive role: gas closed (when the signal pressure increases, the valve position downward displacement), "B"

The reaction gas (when the valve open upward displacement signal when the pressure increases, "K")

The 3 and three way regulating valve core structure is a cylinder type thin wall window shaped valve core, adopting the valve core side guiding and the valve seat inner surface guiding and the upper bushing guiding, so the guiding area is large, and the work is reliable. The flow direction of the spool is in the flow state, so the valve performance is stable.

4, three valve three confluence valve (two fluid by a three-way valve mixed into a fluid) and three way flow regulating valve (a fluid through the valve is divided into two out of two forms). When the nominal diameter of DN is less than or equal to 80mm and less pressure occasions when the shunt valve can confluence valve replacement by the same caliber. There are two kinds of flow characteristics, linear and parabolic.

5, three way control valve, which can replace two simultaneous use of two pass control valve, from the diversion or confluence role and two-phase adjustment ratio role.

This series of products are widely used in chemical industry, petroleum, metallurgy, power plant, textile, paper making and pharmaceutical industry production process automation adjustment and remote control. The product pressure level of a PN1.6 4 6.4MPa; nominal diameter DN25~300mm; for fluid temperature of -40~+450 DEG C; according to the temperature level with different valve cover at room temperature, high temperature two

Actuating mechanism

ZHA/B type multi spring pneumatic film actuating mechanism consists of diaphragm, compression spring, tray, push rod, bracket, axle sleeve, film cover and other main parts. Is a new type of gas to solve the problem of old type ZMA/B single spring pneumatic diaphragm actuator of large size, heavy, deep corrugated diaphragms are not reliable design and development of the pneumatic diaphragm actuator, the cover plate, limiting parts adopt steel stamping molding. The shape of the diaphragm is complex, and a special pressing process is adopted to make the blasting strength more than 22kg/cm2. The multi spring form improves the manufacturability of the spring manufacture and facilitates the matching of different spring ranges. The adjustable zero function improves the linear accuracy. Surface treatment is made of epoxy powder, not sprayed with high fastness and corrosion resistance. The utility model has the advantages of uniform force, good stability, small size, light weight and the like. Using compressed air as power source, to accept the pressure signal of electric - gas valve positioner or solenoid valve input, the pressure thrust compression spring assembly in a membrane chamber of the diaphragm, and the push rod displacement, force generated when the push rod and the spring is compressed after the group phase equilibrium, stability in the corresponding stem stroke. According to the force balance principle, the stroke size is proportional to the input size of the pressure signal, so as to achieve the accurate positioning of the valve spool.