Medium used as a cut-off valve in the full-time through the entire flow, this time the pressure medium to run minimal loss. Valve is usually applied to less frequent open and close, but also to maintain full-or full-closed gate of the working conditions. Does not apply to the use of a regulator or throttling. For high-speed flow of medium, open the gate in local conditions can cause the vibration of the gate, but they may damage the vibration damper and the valve seat sealing surface, while the throttling damper will suffer erosion of the medium. From a structural form, the main difference is that the sealing component used in the form of. According to the form of sealed components, often divided into several different types of valve, such as: wedge gate valve, parallel-type valve, parallel Shuangzha plate gate valve, wedge gate, etc. Shuangzha board. The most common form of wedge gate valves and parallel-type valve. Valve
As the valve stem and valve seat sealing surface perpendicular to the axis. Valve stem to open or close the trip is relatively short, and has very reliable cutting action, makes this valve ideally suited as a medium and cutting off or regulate the use of. Cut-off valve when the valve flap in the open position, and its valve seat and valve sealing surface is no longer between the contacts and has a very reliable cutting action, and combine this valve is suitable as a medium to cut off or adjust and cutting use.
Once the cut-off valve is turned on, its seat and the valve between the valve sealing surface is no longer in contact, so it's a smaller sealing surface mechanical wear, as most of the cut-off valve seat and valve flap is easier to repair or replace When sealing element is not required to remove the entire valve from the pipeline to which the valve and pipeline welding for the occasion into one is very applicable. Medium through such valve when the flow direction changed, so a higher cut-off valve of the flow resistance in other valves. |
Commonly used cut-off valves are the following: 1) Angle type globe valve; in angle-type stop valve, the fluid simply by changing a direction, so that through this valve on the pressure drop than the conventional structure of small cut-off valve. 2) DC-type cut-off valve; in the DC-type or Y-shaped cut-off valve, the valve of the flow channel and mainstream Road into a slash, so that movement of the state extent of the damage is smaller than the conventional cut-off valve, so the pressure loss through the valve is also the corresponding smaller. 3) The plunger-type valve: This form of cut-off valve is a variant of conventional cut-off valve. In the valve, the valve flap and valve seats are usually based on the plunger principle of design. Polished into a flap valve stem is connected with the plunger, the plunger seal is on the two sets of flexible seals achieved. Two elastic rings separated by a ring, and through a valve cover nut the load exerted on the valve cover seals around the plunger pressure prison. Elastic ring can be replaced, you can use a variety of material, the valve is mainly used for "open" or "off", but with a special form of plunger or special rings can also be used to adjust flow.
Butterfly
Butterfly valve butterfly plate installed in the direction of the pipe diameter. Cylindrical channel in the valve body, the disc-shaped butterfly plate around the axis of rotation, rotation angle of 0 ° ~ 90 ° between the rotation to 90 ° when the valve is fully open state license.
Butterfly simple structure, small size, light weight, only by a small number of parts. And just rotate 90 ° to quickly open and close, easy to operate, while the flow control valve has a good feature. Butterfly in the fully open position, the butterfly plate thickness is only when the medium flows through the valve body resistance through the valve so the pressure drop generated by small, it has good flow control characteristics. There are shells and metal sealing butterfly valve seal two kinds of sealed type. Elastic sealing valves, seals can be mounted on the body or attached to the butterfly board peripheral.
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