ANSI Standard Resilient Seated Gate Valve N.R.S.

The difference between rising stem gate valve and non-rising stem gate valve:

1. The rising stem gate valve can see the screw rod, but the non-rising stem gate valve cannot see the screw rod.

2. The rising stem gate valve raises or lowers the valve clack through the threaded transmission of the valve stem and the steering wheel; when the non-rising stem gate valve is switched on and off, the steering wheel and the valve stem are connected together and relatively immobile. Drive the valve flap upwards and downwards to complete the opening and closing.

3. The drive thread of the non-rising stem gate valve is located inside the valve body. During the opening and closing process, the valve stem only rotates, and the gate is raised and lowered in the valve body. The transmission thread is outside the valve body, and the opening and closing and position of the gate can be intuitively judged according to the movement direction and position of the valve stem.

4.The height of the non-rising stem gate valve is small; the rising stem gate valve requires a larger installation space.

5. The structure of the rising stem gate valve is beneficial to the lubrication of the valve stem, and the degree of opening and closing is obvious; the thread of the stem of the non-rising stem gate valve in not only unable to the lubricated, but it is directly corroded by the medium and is easily damaged. Therefore, the rising stem gate valve is more widely used.