How to choose the correct vacuum valve

How to choose the correct vacuum valve

Vacuum valves mainly include vacuum ball valves, vacuum butterfly valves, vacuum diaphragm valves, vacuum gate valves, vacuum shut-off valves, vacuum valve types, and different applications. Below are the different types of valves such as gate valves, globe valves, butterfly valves, and ball valves. The characteristics of the valve and the common areas. Finally, how to choose the valve according to the different requirements of use, such as selecting the valve according to the reverse flow prevention medium and selecting the valve according to the adjustment medium parameters.

I. Introduction and selection of vacuum gate valve

The vacuum gate valve is used as a cut-off medium. When it is fully open, the whole flow is straight through, and the pressure loss of the medium operation is minimum. Shenzhen European valve gate valve is generally suitable for working conditions that do not require frequent opening and closing, but also keep the gate fully open or fully closed. Not suitable for use as an adjustment or throttling. For high-speed flowing media, the gate can cause vibration of the gate under partial opening conditions, and the vibration may damage the sealing surface of the gate and the valve seat, and the throttling will cause the ram to be eroded by the medium. The main difference in terms of structural form is the form of the sealing element used. Depending on the form of the sealing element, the gate valves are often divided into several different types, such as wedge gate valves, parallel gate valves, parallel double gate gate valves, wedge double gate gates, and the like. The most common forms are wedge gate valves and parallel gate valves.

Second, the introduction and selection of vacuum shut-off valve

The stem axis of the vacuum shutoff valve is perpendicular to the seat sealing surface. The valve stem has a relatively short opening or closing stroke and a very reliable shut-off action, making this valve ideal for use as a medium for cutting or regulating and throttling. Once the valve flap of the shut-off valve is in the open state, its seat and the sealing surface of the disc are no longer in contact, and it has a very reliable cutting action. This valve is very suitable as the cutting or adjusting and section of the medium. Stream usage.

Once the Shenzhen Euro Valve cut-off valve is open, there is no contact between its seat and the disc sealing surface, so its sealing surface is less mechanically worn, because the valve seat and disc of most shut-off valves are easier. It is not necessary to remove the entire valve from the pipeline when repairing or replacing the sealing element, which is suitable for the case where the valve and the pipeline are welded together. The flow direction of the medium as it passes through such a valve changes, so the flow resistance of the shut-off valve is higher than other valves.

Commonly used shut-off valves are as follows:

1) Angle stop valve; in the angle cut-off valve, the fluid only needs to change the primary direction so that the pressure drop through the valve is smaller than that of the conventional structure.

2) DC-type stop valve; in the DC or Y-shaped stop valve, the flow path of the valve body is inclined with the main flow path, so that the degree of damage of the flow state is smaller than that of the conventional stop valve, and thus the pressure loss through the valve is correspondingly Small.

3) Plunger shut-off valve: This type of shut-off valve is a variant of a conventional shut-off valve.

In this valve, the flap and seat are usually designed based on the principle of the plunger. The valve flap is polished to form a plunger that is coupled to the valve stem, and the seal is achieved by two elastomeric sealing rings that are placed over the plunger. The two elastomeric seals are separated by a collar and the seal around the plunger is pressed by the load exerted by the bonnet nut on the bonnet. The elastomeric seal can be replaced and can be made from a wide variety of materials. The valve is mainly used for "opening" or "off", but with a special form of plunger or special collar, it can also be used to regulate flow. .

Third, the introduction and selection of vacuum butterfly valve

The butterfly plate of the vacuum butterfly valve is installed in the diameter direction of the pipe. In the cylindrical passage of the butterfly valve body, the disc-shaped disc rotates around the axis, and the rotation angle is between 0° and 90°. When the rotation is 90°, the valve is fully open.

The butterfly valve is simple in structure, small in size and light in weight, and consists of only a few parts. Moreover, it can be quickly opened and closed by only rotating 90°, and the operation is simple, and the valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the disc is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is small, so it has better flow control characteristics. The butterfly valve has two sealing types: a Spring seal and a metal seal. Elastomeric sealing valve, the sealing ring can be mounted on the valve body or attached to the periphery of the disc.

Valves with metal seals generally have a longer life than elastomerically sealed valves, but are difficult to seal completely. Metal seals can accommodate higher operating temperatures, while elastomeric seals have temperature-limited defects.

If a butterfly valve is required for flow control, the main choice is the correct size and type of valve. The structural principle of the butterfly valve is especially suitable for making large diameter valves. Butterfly valves are widely used not only in general industries such as petroleum, gas, chemical, and water treatment, but also in cooling water systems for thermal power plants.

Commonly used butterfly valves are clip-on butterfly valves and flanged butterfly valves. The wafer type butterfly valve uses a stud bolt to connect the valve between the two pipe flanges. The flange type butterfly valve has a flange on the valve, and the flanges on both ends of the valve are connected to the pipe flange by bolts.

Fourth, the introduction and selection of vacuum ball valve

The vacuum ball valve evolved from a plug valve. It has the same 90 degree lift action, except that the plug body is a sphere with a circular through hole or passage through its axis. The ratio of the spherical surface to the passage opening should be such that when the ball is rotated 90 degrees, the spherical surface should be entirely present at the inlet and outlet, thereby cutting off the flow.
The ball valve only needs to be rotated 90 degrees and a small turning torque to close tightly. The fully equal valve body cavity provides a small, straight-through flow path for the medium. Ball valves are generally considered to be the most suitable for direct opening and closing, but recent developments have designed ball valves to provide throttling and control flow. The main features of the ball valve are its compact structure, easy operation and maintenance, suitable for general working media such as water, solvent, acid and natural gas, and also suitable for medium with harsh working conditions such as oxygen, hydrogen peroxide, methane and ethylene. The ball valve body may be integral or combined.

Baking cooling rack

Baking rack,baking cooling mesh,baking Cooling Rack,cooling rack, steel wire cooling rack, etc.

Baking wire mesh is made of high quality 304 stainless steel, never rusting and durable. Cooling Wire mesh does not have any coating or chemical ingredients, making food safer.

Multi-functional Grill Cooking rack: the wire mesh is mainly used for outdoor cooking, it can also be used as a cooling and baking rack. Or you can develop other uses for it.

Cooling Rack,Barbecue Wire Mesh,Barbecue Mesh Grill,Bbq Mesh,Bbq Grill Metal Mesh

Shenzhen Lanejoy Technology Co.,LTD , https://www.szstainlesssteelwiremesh.com