Rising stem gate pneumatic valve and what is the difference between pneumatic valve non-rising stem gate

brake pneumatic valve according to the structure of the pneumatic valve stem can be divided into:
stem brake pneumatic valve, pneumatic valve stem nut on the pneumatic valve cover or stents, open and close the damper, using rotating pneumatic stem nut to realize the rise and fall of pneumatic valve stem. This structure is good for pneumatic lubrication of the stem, the degree of opening and closing, so widely used.

non-rising stem brake pneumatic valve, pneumatic valve stem nut in pneumatic valve body, direct contact with the media. When open and close the damper using rotary pneumatic valve stem. The advantage of this structure is: the height of the pneumatic valve gate always remains the same, so the space is little, installation is suitable for large diameter or restricted the pneumatic brake valve installation space. With this kind of structure to open and close indicator, to indicate the degree of opening and closing. The disadvantage of this structure is: pneumatic valve stem threads without lubrication, and directly to medium erosion, easy to damage.

main difference:

. Non-rising stem pneumatic valve flange gate and the ascension of the screw is only rotate under the supreme and moving, the leakage is a lever, the nut is fixed on the disc, improve ram through the rotation of the screw, no visible door frame; Pneumatic valve stem flange gate lifting screw is exposed, the nut is close to the handwheel and fixed ( Not rotating axial movement) , improve ram through rotation of the screw, the screw and the rotation of the damper is the relatively movement without the relative axial displacement, appearance is a door shape bracket.

is invisible screw non-rising stem pneumatic valve, and Ming is that can see the screw rod.

. Non-rising stem pneumatic valves in the valve stem is connected to the switch when the steering wheel and pneumatic relatively fixed together, it is through the pneumatic valve stem in fixed point rotation to drive the pneumatic valve disc up and down brake to complete opening and closing. Rising stem pneumatic valve by pneumatic valve rod and screw thread of the steering wheel drive to ascend or lowered pneumatic disc.