3. The influence of pressure difference before and after valve on sealing performance Theoretically, the pre- and post-valve pressure difference and leakage are proportional. However, the test proved that, under the same conditions, the increase in leakage is more than the increase in pressure difference. 4. The influence of sealing surface material and its treatment state on sealing performance T...

According to the structure of the valve stem, the gate valve can be divided into Rising Stem Gate Valve and Non Rising Stem Gate Valve. 1. Rising Stem Gate Valve: The valve stem nut is on the bonnet or bracket. When opening and closing the wedge, you can rotate the valve rod nut to realize the lifting and lowering of the valve rod. This structure is beneficial to the lubrication of the valve rod, ...

Soft seal and hard seal are judged according to the sealing material of the valve seat. Soft seal: one side of the sealing pair is made of metal material, and the other side is made of elastic non-metallic material. This seal has good sealing performance, but it is not resistant to high temperature and abrasion, and has poor mechanical property. Hard seal: both sides of the sealing pair ...

The biggest difference between the ball valve and the butterfly valve is that the opening and closing parts of the butterfly valve are a plate, while the ball valve is a ball. Characteristics of Butterfly Valve: 1. Simple structure, low consumption and low cost, but poor tightness and bearing capacity; 2. Quick opening and closing, small flow resistance; 3. It is suitable for making large diameter...

Although wafer check valves and swing check valves serve the same functions—such as preventing backflow, enabling low-load pump startup, and reducing water hammer—they differ significantly in design standards, structural features, and areas of application. This article analyzes their differences across five key aspects to help users make more informed decisions when selecting a suitabl...