The sealing principle of the valve and the BS5163 resilient seated gate valve products
There are many types of valves, but the basic function is the same, that is to connect or cut off the flow of media. Therefore, the sealing problem of the BS5163 resilient seated gate valve is very prominent.
To ensure that the BS5163 resilient seated gate valve can cut off the flow of the medium well without leakage, it is necessary to ensure that the valve is well sealed. There are many reasons for valve leakage, including unreasonable structural design, defective sealing contact surface, loosening of fastening parts, loose fit between valve body and bonnet, etc. All these problems may lead to improper valve sealing. Good, resulting in leakage problems. Therefore, valve sealing technology is an important technology related to valve performance and quality, and in-depth systematic research is required.
Since the BS5163 resilient seated gate valve was produced to the present, its sealing technology has also experienced great development. So far, valve sealing technology is mainly embodied in two aspects, namely static sealing and dynamic sealing.
The so-called static seal usually refers to the seal between two static surfaces. The sealing method of static seal mainly uses gaskets.
The so-called dynamic seal mainly refers to the sealing of the BS5163 resilient seated gate valve stem, that is, preventing the medium in the valve from leaking with the movement of the valve stem. The sealing method of dynamic sealing is mainly to use a stuffing box.
Static sealing refers to the formation of a seal between two static sections. The sealing method is mainly to use gaskets. There are many types of gaskets. Frequently used gaskets include flat gaskets, O-rings, wrap gaskets, special-shaped gaskets, wave gaskets and winding gaskets. Each type can be further divided according to the different materials used.
①Flat washers. Flat washers are flat washers that are placed between two static sections. Generally, they can be divided into plastic flat washers, rubber flat washers, metal flat washers and composite flat washers according to the materials used. Each BS5163 resilient seated gate valve has its own flat washers. The scope of application.
②O-ring. O-ring refers to a gasket with an O-shaped cross-section. Because its cross-section is O-shaped, it has a certain self-tightening effect, so the sealing effect is better than that of a flat gasket.
③Pack the gasket. Wrapped gasket refers to a gasket that wraps a certain material on another material. Such gaskets generally have good elasticity and can enhance the sealing effect.
④Special-shaped washers. Special-shaped washers are those with irregular shapes, including oval washers, diamond washers, gear washers, dovetail washers, etc. These washers generally have a self-tightening effect and are mostly used in high and medium pressure valves.
⑤Wave washer. Wave washers are washers with only wave shapes. Such washers are usually composed of a combination of metal and non-metal materials, and generally have the characteristics of small pressing force and good sealing effect.
⑥Wound washer. Spiral wound gasket refers to a gasket formed by tightly adhering a thin metal belt and a non-metallic belt together and winding them. This type of gasket has good elasticity and tightness.
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