The pneumatic valve is to make use of compressed air-driven valves. Pneumatic valves in a procurement should indicate the specifications, type, the working pressure to meet the requirements of procurement practices, pneumatic valve manufacturer for the product of competition, each in the idea of ​​the unified design of the pneumatic valve for different innovation, the formation of their own corporate standards and personality. The pneumatic valve in the pipe should be installed horizontally.

First, the pneumatic valve operating mechanism:

Opening and closing direction of a pneumatic valve operation should be clockwise closing;

Due to the pneumatic valve in the pipe network, often manually opening and closing rotation should not be too large diameter valve should be transferred within the 200-600;

3 In order to facilitate the opening and closing operation of a plumber pressure conditions, the maximum opening and closing torque should 240N-m;

4 pneumatic valves open and close operation end of the mortise and tenon, and the size standard, and facing the ground so that people can be directly manipulated from the ground. With a wheel valve does not apply to the underground pipe network.

Pneumatic valve opening and closing degree of the display plate

(1) pneumatic valve opening and closing degree of the scale lines should be cast on the disc casing of the gearbox cover or change the direction, all facing the ground, the scale wire brush on the phosphor to show striking;

② indicates the needle plate material in the better management of available stainless steel plate, otherwise the steel plate of the painting, do not use aluminum leather production;

③ indicates that the plate pin is visible, fixed firmly when opening and closing the accurate adjustment should rivet lock.

4.6 If the pneumatic valve is buried deeper, the operating mechanism and plate from the ground distance ≥ 1.5m, with extension bar facilities, and fixed-rate stability in order to observe from the ground and operating. In other words, the opening and closing valves in the pipe network, and should not go down the job.

Second, the pneumatic valve performance testing:

5.1 Valves should be entrusted to an authoritative body of a standard high-volume manufacturing, the following performance testing:

① valve opening and closing torque in the pressure in the working conditions;

② in the pressure in the working conditions, to ensure the valve tightly closed continuous opening and closing times;

③ valve detection in the conditions of aqueduct flow resistance coefficient.

5.2 The valve should be carried out at the factory following the detection of:

① valve in the open position, the valve body should bear the value of two times the working pressure valve within the pressure test;

② valve closed position, both sides were to withstand 1.1 times the working pressure valve value, no leakage; metal sealing butterfly valve, leakage is no greater than the relevant requirements.