As the difference between the pneumatic valve and pneumatic valve gate

principle of work, by the pneumatic valve pneumatic valve lever is rising, the handwheel with the pneumatic valve stem rotation and upward movement. Brake is pneumatic valve hand wheel rotation, pneumatic valve lever upward movement. Pneumatic flow, gate valve fully open, by the pneumatic valve is not. Brake pneumatic valve without direction of import and export requirements, by the pneumatic valve has a regulation to import and export!
pneumatic valve gate and globe pneumatic valve, pneumatic valve is shut off is the most common two kinds of pneumatic valve.
from the shape of brake pneumatic valve is shorter than the pneumatic valve and high, especially the height of the pneumatic valve stem need higher space. Brake pneumatic valve sealing surface have certain self sealing ability, it depend on medium pressure pneumatic valve core tightly contact with pneumatic valve seat sealing surface, to not leak tight. Pneumatic wedge gate valve pneumatic valve core of the slope is commonly ~ degrees, when forced to shut down or excessive temperature changes large pneumatic valve core is easily jammed. So, high temperature and high pressure pneumatic wedge gate valve, in structure adopted some measures to prevent pneumatic valve core card dead. Brake pneumatic valve in the open and closed when the pneumatic valve core and pneumatic valve seat sealing surface contact and friction each other all the time, thus sealing surface wear and tear, especially in the pneumatic valve was nearly closed state, the pneumatic valve core pressure difference is very big, before and after sealing surface wear is more severe.
brake pneumatic valve compared with by the pneumatic valve, its main advantage is that fluid flow resistance is small, the flow resistance coefficient of the pneumatic valve is about ordinary gate. ~。 And ordinary as the resistance coefficient of pneumatic valve is about. ~。 。 Open the closing force is small, medium to two direction. Defect is complex, highly size is larger, sealing surface is easy to wear. As pneumatic valve sealing surface, must to force close the pneumatic valve to seal, in the same diameter, working pressure and, under the drive of the pneumatic valve driving torque of brake of the pneumatic valve. ~。 Times. This point in the electric pneumatic valve torque adjustment control institutions, should be attention.
as pneumatic valve sealing surface, touch each other only when fully closed, closed pneumatic valve core and the sealing surface of the relative slip is very small, and sealing surface wear is small. Pneumatic valve sealing surface of the wear and tear, mostly because of the pneumatic valve core and the sealing surface before have sundry, or imprecise is due to the closed position, cause of high speed scouring caused by.
stop pneumatic valve when installed, medium can enter and from the bottom of the pneumatic valve core from above into one of two ways. Medium enters from the bottom of the pneumatic valve core has the advantage that when the pneumatic valve closing packing, no pressure can prolong the service life of the packing, and can be pneumatic valve before the pipeline pressure, to replace the packing work. Medium from the bottom of the pneumatic valve core into the disadvantage is that the pneumatic valve driving torque is bigger, above is about to enter. ~。 Times, pneumatic valve rod by the axial force is big, pneumatic valve rod bend easily. Therefore, medium to enter from below way, generally applies only to small manual by the pneumatic valve, pneumatic valve is closed to the medium on the pneumatic valve core strength is not greater than kg is limited. Electric pneumatic valve is generally used as medium access from above. Medium entering way from above shortcomings just as opposed to enter below.
stop pneumatic pneumatic valve and gate valve, advantage is simple structure, good sealing performance, convenient manufacture and maintenance; Defect is liquid resistance is big, big opening and closing force. Pneumatic valve and globe pneumatic brake valve to full open type pneumatic valves fitted, as cut off or connect medium, should not be used as adjusting the pneumatic valve.
as the application range of the pneumatic valve and gate valve is determined according to its characteristics. In smaller channels, when requirements better shut off seal, use as more pneumatic valve; In the steam pipe and large diameter of water pipe, due to the fluid resistance is small, adopts pneumatic valve gate.