Six Solutions to The Leakage of Control Valves

Six solutions to the leakage of the control valve
1) Increasing the sealing grease method
For valves that do not use sealed grease, can increase the sealing grease to improve stem seal performance.

2) Increasing the packing method
In order to improve the sealing performance of the packing on the stem, a method of increasing the packing may be used. Usually using double-layer, multi-layer mixed filler form, simply increase the number, such as 3 to 5, the effect is not obvious.

valve fittings

3) Replace the graphite packing method
Large use of PTFE filler, because of its operating temperature is in the range of -20 ~ +200, when the temperature is in the upper and lower limits, changes in the larger, the seal will be significantly reduced, aging fast, short life. Flexible graphite fillers can overcome these shortcomings and long service life. So some of the factory all the PTFE filler to graphite filler, and even the newly purchased control valve will be one of the PTFE filler into graphite filler after use. But the use of graphite filler hysteresis, and some also have a crawling phenomenon, which must be considered.

Divert Valves

4) Changing the flow direction, set P2 in the stem end method
When the △ P is large, P1 is large, the seal P1 is clearly more difficult than the seal P2.Therefore, can be taken to change the flow direction, P1 in the stem end to P2 at the stem end, which is high pressure, Large sanitary check valves are more effective, such as bellows valves that should normally be considered for sealing P2.

5) Using lens pad sealing method
For the seal of the upper and lower covers, the valve seat and the upper and lower valve body seal. If the plane seal, under high temperature and high pressure, poor sealing, causing leakage, you can use the lens pad seal, can get satisfactory results.

6) Replacing the gasket
So far, most of the gasket is still using asbestos board, at high temperatures, poor sealing performance, life is short, causing leakage. In this case, you can use the winding gasket, “O” ring, now many plants have been used sanitary valves.

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The Difference of Pneumatic and Hydraulic Sanitary Valves

The difference of Pneumatic and hydraulic sanitary valves in the drive
Pneumatic and hydraulic sanitary valves were operated by a certain pressure of air, water, power, used cylinder and piston movement to drive the health-class valves, the general pneumatic air pressure is less than 0.8MPa, hydraulic or hydraulic pressure is between 2.5 MPa and 25 MPa.

ball valves

It can be used to drive the sanitary check valves, sanitary diaphragm valve; rotary gas and liquid ball valves, plug valves or butterfly valves and other valves. The driving force of the hydraulic device is large, and it is suitable for driving large diameter valves.
Sanitary Butterfly Valves
If used to drive the plug valve, ball valve and butterfly valve, you must use the reciprocating motion of the piston to change the surface rotary motion. In addition to the use of cylinder or cylinder piston to drive, there are pneumatic film driven, because its travel and driving force is small, it is mainly used to adjust the sanitary valves.

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Classification and Introduction of Stainless Steel Tee

Classification and Introduction of Stainless Steel Tee
Stainless steel pipe fittings, not just stainless steel elbows, there are three links, three pipe fittings with three openings called the three-way pipe. Tees are generally used to keep liquid, gas pipe network. Because of different mediums, tee material of sanitary ball valves is divided into: cast iron, cast steel, cast copper, cast aluminum, plastic, glass and so on.
3 way ball valve
Three pipe, three-way pipe, there are three holes, meaning an import, two exports; or two imports, one export. Chemical tube of a T-shaped and Y-shaped, there are equal diameter nozzle, there are different diameter nozzle, for the same three or different pipeline gathering place. Its main role is to change the direction of the fluid.
3 way valve
Varieties: Tee material can be divided into metal and non-metallic materials. Metallic material of the three ways ball valves are carbon steel, stainless steel, alloy steel, threaded three links is standardized Magang, the implementation of GB is GB / 12459-2005. Non-metallic materials of the three connections are PVC, UPVC, PPR and so on.
According to the convergence mode, it can be divided into two types such as snap-in and thread connection.
According to the shape, it can be divided into T-shaped, herringbone.

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