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русскийGenerally, the ball valve usually uses rubber, nylon and PTFE as the sealing ring material of the valve seat, so its use temperature is subject to the improper selection of the sealing agent, or the sealing surface is formed, and the valve plug cannot be rotated in the valve body. When the valve is overhauled, the valve must be overhauled.
Cylindrical plug valve, a PTFE sleeve is installed in the valve body to seal with the valve plug, it is pressed in the valve body with a compression nut, and the sealing is achieved by the expansion force of the valve cold on the PTFE needle.
2.6.2 Conical plug valve
(1) Tight-type conical swirl valve
This kind of plug valve has no packing, and the sealing between the valve plug and the sealing surface of the valve body is realized by tightening the nut under the plug, and is generally used in low-pressure occasions with nominal pressure PN<0.6MPa. The shape of the conical swivel valve with small U-diameter female thread connection is shown in . When the valve plug is in close contact with the valve body, the valve plug can still be rotated, or it can be lifted from the valve seat and rotated by 90° before being pressed into the seal.
(2) Packed Conical Plug Valve
Conical plug valve eg. The packing type conical plug valve has packing in the valve body, and the sealing surface of the valve plug and the valve body is sealed by pressing the packing. This packing type conical rotary valve has good sealing performance and is used in the occasions where the nominal pressure PN < 0.6MPa. The screw under the valve body is used to adjust the tightness between the valve plug and the valve body.
Tight Foot Cone Plug Valve Oka Cone Plug Valve
3-Teflon sleeve simple sealing conical plug valve
In order to overcome the problem of lubrication and maintenance of the plug valve, this kind of teflon sleeve simple sealing conical plug valve was developed. In this valve, the valve plug rotates in a Teflon sleeve embedded in the valve body, which avoids the sticking of the valve cold. However, due to the large sealing area and high sealing stress, the operating torque is still large. On the other hand, due to the large sealing area, even if there is some damage to the sealing surface, it can still prevent leakage better, so this kind of valve is strong and durable.
