8 July: A big size stem, waiting for shipment.Then delivery to abroad. Ganate Stem. E-mail:email@example.com Any inquiry for stem, handwheel and balls, pls contact us.
Since 2010, many domestic valve manufacturers have developed soft-sealed gate valves. Compared with the traditional type or parallel-type double-gate gate valves, the gate valves have the following characteristics: 1. The valve body and bonnet of the soft-sealed gate valve are precision cast.
Conventional gate valves often accumulate in the groove of the valve bottom due to foreign matter such as stones, wood blocks, cement, paper scraps, and debris after the water is washed. It is easy to cause the water to close and form a water leakage phenomenon.
The gate of the wedge gate valve can be made into a whole, called a steel gate; it can also be made into a gate that can produce a slight deformation to improve its processability and compensate for the deviation of the sealing surface angle during the processing. The shutter is called a resilient shutter.
Soft seal gate valve, industrial valve, soft seal gate valve opening and closing member is the gate, the direction of movement of the gate is perpendicular to the fluid direction, the gate valve can only be fully open and fully closed, can not be adjusted and throttled.
The detachable surface part of the valve is used to support the fully closed position of the valve core and constitute a sealing pair. The general seat diameter is the maximum diameter of the valve. For example, the valve seat of the butterfly valve is very wide.
The valve stem is subjected to tension, pressure and torsion during the opening and closing of the valve, and is in direct contact with the medium, and there is relative frictional movement between the valve and the packing.
Most compressed fillers use their fibers as a binder because of the properties of asbestos. It is basically unaffected by most media, temperature and time and is a good thermal conductor.The disadvantage of asbestos is poor lubricity, so it is necessary to add lubricants that do not interfere with the performance of asbestos, such as graphite powder and mica powder.
Generally, the brands selected are QA19-2 and HPb59-1-1. Applicable to low pressure valves with nominal pressure less than or equal to 1.6 MPa and temperature less than or equal to 200 degrees.
The valve stem is not only a moving part, a force receiving part but also a sealing part during the opening and closing process of the valve. At the same time, it is subject to the impact and corrosion of the media and also creates friction with the filler.