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The difference and use of plunger valve and stop valve

Label: stop, stop valve, difference, use added time: May 25, 2021 click 1294 second

The closing of the plunger valve is composed of a stainless steel plunger, two elastic sealing rings at the top and the bottom and a metal spacer frame. The sealing result is achieved by the close cooperation between the plunger and the sealing ring. When the plunger is inserted in the two sealing rings, the sealing area is larger than that of the conventional stop valve; When the plunger valve is opened and closed, the plunger moves slowly in the sealing ring Foshan environmental protection oil wholesale Henan Personnel Examination Center When closing, the plunger is inserted into the lower sealing ring to cut off the flow passage; When opening, although the plunger leaves the lower sealing ring, it is still hidden in the upper sealing ring to keep it isolated from the outside and prevent leakage. Plunger valve is composed of valve body, valve cover, valve stem, plunger, hole frame, sealing ring, hand wheel and other parts ? When the hand wheel rotates, the plunger is driven up and down in the center of the hole frame through the valve rod to complete reciprocating activities Stainless steel valve Open and close function. The opening and closing parts of the globe valve are plug-shaped disc, the sealing surface is flat or conical, and the valve disc moves in a straight line along the middle line of the fluid. ? The closing of the plunger valve is composed of a stainless steel plunger, two elastic sealing rings at the top and the bottom and a metal spacer frame. The sealing result is achieved by the close cooperation between the plunger and the sealing ring. When the plunger is inserted in the two sealing rings, the sealing area is larger than that of the conventional stop valve; When the plunger valve is opened and closed, the plunger moves slowly in the sealing ring, and the contact surface is hardly worn. When the plunger valve is closed, the plunger is inserted into the lower sealing ring to cut off the flow passage; When opening, although the plunger leaves the lower sealing ring, it is still hidden in the upper sealing ring to keep it isolated from the outside and prevent leakage. The globe valve is a kind of forced sealing stainless steel valve, so when the stainless steel valve is closed, pressure must be applied to the valve disc to force the sealing surface from leaking. When the medium enters the stainless steel valve from the lower part of the valve disc, the resistance that the operating force must overcome is the friction force between the valve stem and the packing and the thrust generated by the pressure of the medium. The force to close the stainless steel valve is greater than that to open the stainless steel valve, so the diameter of the valve stem should be larger, otherwise the valve stem will be bent.

The globe valve has the following advantages:
1. It is simple in structure and convenient in manufacture and maintenance. ?
2. The working stroke is small and the opening and closing time is short. ?
3. Good sealing performance, small friction force between sealing surfaces and long service life. ?
The defects of the stop valve are as follows:
1. The fluid resistance is large, and the force required for opening and closing is large. ?
2. It is not suitable for medium with particles, high viscosity and easy coking. ?
3. Poor regulation performance. ?
As mentioned above, the advantage of plunger valve is that its opening and closing speed is slow
Plunger valve series of stainless steel valve products are suitable for gold, electricity, chemical, oil refining, chemical fertilizer, textile, light industry, food and other industries. The pressure is within 16-25kgf / cm2, and the temperature is below 250 ℃. It can be used as the opening and closing assembly of medium flow on water, steam, oil and other pipelines. It can also be used to adjust the flow. The appearance of plunger is processed by high precision cylindrical grinder. The sealing ring is made of new non-toxic sealing material with strong elasticity and high wear resistance, so it is reliable and durable. Thus, the service life of plunger valve is improved.

1. Structure comparison of plunger valve and stop valve:

? ? 1) Structure of plunger valve:

? ? ? Plunger valve is composed of valve body, valve cover, valve stem, plunger, hole frame, sealing ring, hand wheel and other parts. When the hand wheel rotates, the plunger is driven up and down in the center of the hole frame by the stem of the plunger valve to complete the opening and closing function of the stainless steel valve.

? ? 2) Structure of stop valve:

? ? ? The opening and closing parts of the globe valve are plug-shaped disc, the sealing surface is flat or conical, and the valve disc moves in a straight line along the middle line of the fluid.

2. Comparison of working principle between plunger valve and stop valve:

? ?( 1) Working principle of plunger valve:

? ? ? The closing of the plunger valve is composed of a stainless steel plunger, two elastic sealing rings at the top and the bottom and a metal spacer frame. The sealing result is achieved by the close cooperation between the plunger and the sealing ring. When the plunger is inserted in the two sealing rings, the sealing area is larger than that of the conventional stop valve; When the plunger valve is opened and closed, the plunger moves slowly in the sealing ring, and the contact surface is hardly worn. When the plunger valve is closed, the plunger is inserted into the lower sealing ring to cut off the flow passage; When opening, although the plunger leaves the lower sealing ring, it is still hidden in the upper sealing ring to keep it isolated from the outside and prevent leakage.

? ? ( 2) Working principle of stop valve:

? ? ? The globe valve is a kind of forced sealing stainless steel valve, so when the stainless steel valve is closed, pressure must be applied to the valve disc to force the sealing surface from leaking. When the medium enters the stainless steel valve from the lower part of the valve disc, the resistance that the operating force must overcome is the friction force between the valve stem and the packing and the thrust generated by the pressure of the medium. The force to close the stainless steel valve is greater than that to open the stainless steel valve, so the diameter of the valve stem should be larger, otherwise the valve stem will be bent.

3. The advantages and disadvantages of stop valve are as follows:

? ? ( 1) Benefits of globe valves:

? ? ? The globe valve has the following advantages: simple structure, convenient manufacture and maintenance, small working stroke and short opening and closing time. Good sealing performance, small friction force between sealing surfaces and long service life.

? ? ?( 2) Defects of stop valve:

? ? ? The disadvantages of the globe valve are as follows: high fluid resistance, large force required for opening and closing. It is not suitable for medium with particles, high viscosity and easy coking. Poor regulation performance.

? ? As mentioned above, the advantage of plunger valve is that its opening and closing speed is slow. Through the above analysis, the difference between plunger valve and stop valve has been better understood. With the help of modern science and technology, these two kinds of products will certainly be more suitable for the market demand, and the boundary between these two kinds of products will be narrower and smaller one day in the future.

Difference between plunger valve and stop valve
The plunger valve is composed of valve body, valve cover, valve stem, plunger, hole frame, sealing ring, hand wheel and other parts. When the hand wheel rotates, the plunger is driven up and down in the center of the hole frame to complete the opening and closing function of the stainless steel valve. The opening and closing parts of the globe valve are plug-shaped disc, the sealing surface is flat or conical, and the valve disc moves in a straight line along the middle line of the fluid.
The closing of the plunger valve is composed of a stainless steel plunger, two elastic sealing rings at the top and the bottom and a metal spacer frame. The sealing result is achieved by the close cooperation between the plunger and the sealing ring. When the plunger is inserted in the two sealing rings, the sealing area is larger than that of the conventional stop valve; When the plunger valve is opened and closed, the plunger moves slowly in the sealing ring, and the contact surface is hardly worn. When the plunger valve is closed, the plunger is inserted into the lower sealing ring to cut off the flow passage; When opening, although the plunger leaves the lower sealing ring, it is still hidden in the upper sealing ring to keep it isolated from the outside and prevent leakage.

The globe valve is a kind of forced sealing stainless steel valve, so when the stainless steel valve is closed, pressure must be applied to the valve disc to force the sealing surface from leaking. When the medium enters the stainless steel valve from the lower part of the valve disc, the resistance that the operating force must overcome is the friction force between the valve stem and the packing and the thrust generated by the pressure of the medium. The force to close the stainless steel valve is greater than that to open the stainless steel valve, so the diameter of the valve stem should be larger, otherwise the valve stem will be bent.
The globe valve has the following advantages: simple structure Search engine ranking It is convenient to manufacture and maintain, with small working stroke and short opening and closing time. Good sealing performance, small friction force between sealing surfaces and long service life. The disadvantages of the globe valve are as follows: high fluid resistance, large force required for opening and closing. It is not suitable for medium with particles, high viscosity and easy coking. Poor regulation performance. As mentioned above, the advantage of plunger valve is that its opening and closing speed is slow.

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