Gate valves according to the structure of the valve stem can be divided into: 1, rising stem gate valves: stem nut on the cover or stents, open and close the damper, using rotating stem nut to realize the rise and fall of the valve stem. This structure is good for the lubrication of the stem, the degree of opening and closing, so widely used. 2, non-rising stem gate valve: the valve stem nut in the valve body, direct contact with the media. Open and close the damper, the rotary valve rod was used to implement. The advantage of this structure is: the height of the gate valve always remains the same, so the space is little, installation is suitable for large diameter or gate of limited 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: the Industrial Valves stem threads not only unable to lubrication, and directly to medium erosion, easy to damage. Rising stem gate and the primary difference between non-rising stem gate valves: 1, non-rising stem 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; Flange valve stem ascending 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. 2, screw non-rising stem valves can't see, and can see the screw stem. 3, non-rising stem valves at the switch when the steering wheel with the valve stem is connected to the relatively fixed, it is through the valve stem in fixed point is lifting rotation to drive the valve disc and the brake to complete opening and closing. Rising stem valves by stem and screw thread of the steering wheel drive to ascend or lowered the disc. Say simple point is rising stem valves are disc attached to do up and down together, the steering wheel is always in the attachment.
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