What is the anti-fire structural design of trunnion mounted ball valve?

Structural anti-fire design trunnion mounted ball valve is when the valve in the event of a fire in the use of the site, when non-metallic materials such as polytetrafluoroethylene seat seals, trunnion mounted ball valve stem seals, trunnion mounted ball valve stem seals and packing flange gasket decomposition or destruction at high temperatures, the trunnion mounted ball valve can be by means of a specially designed metal to metal secondary seal structure, effectively control valve leakage and leakage. Fire safety requirements for users of trunnion mounted ball valves, anti-fire design is according to meet APl 607 standard specifications.

Should you want to know more about ball valve from Reliable China valve manufacturer, please visit www.reliavalve.com or email us via sales@reliavalve.com.

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Trunnion mounted ball valve repair procedures and precautions step instructions

Trunnion mounted ball valve in the closed state, the internal body fluid under pressure is still there, before servicing and relieve line pressure valve in the open position.

1)The first trunnion mounted ball valve repair, disconnect the power or gas source, and the bracket from the actuator.

2)The new parts in the assembly need clean water, non-metallic parts should be cleaned immediately after removal from the cleaning agent, not a long soak.

3)After cleaning the wall needed to be to be washed after volatile cleaning agent (not soaked cleaning agent available silk rub) for assembly, but not for a long time on hold, otherwise it will rust, dust pollution.

4)We must first identify the trunnion mounted ball valve, after removing the pressure downstream pipeline has indeed to be demolished decomposition operation.

5)Care must be taken to prevent damage to the sealing surface of decomposition and re-assembly of the parts, especially when the non-metallic parts, O-rings should be taken when using special tools.

6)Using grease lubrication, grease should be compatible with both fixed ball of metal materials, rubber parts, plastic parts and the working medium, the working medium for the gas, can be used such as 221 special grease. Coated on the surface of the seal mounting groove of a thin layer of grease, spread a thin layer of grease on the rubber seals, valve stem sealing surface and the friction surface coated with a thin layer of grease.

7) Trunnion mounted ball valve assembly bolts on the flange must be symmetrical, gradually and evenly tightened.

8)Cleaning agents should be compatible with fixed ball in the rubber parts, plastic parts, metal parts and the working medium (such as gas) are working medium for the gas, available gasoline (API6D) to clean metal parts, non-metallic parts washed with pure water or alcohol.

9) Trunnion mounted ball valve down decomposition individual parts can dip way to clean, yet left down decomposition of non-metallic parts may be clean metal parts are impregnated with fine clean silk cleaning agents (to avoid fiber loss Adhesion On the part) scrub. It shall be attached to the wall to remove all grease, dirt, rubber, dust and so on.

Should you want to know more about ball valve from Reliable China valve manufacturer, please visit www.reliavalve.com or email us via sales@reliavalve.com.

Relate Products:

WCB ball valves

 from:Trunnion mounted ball valve repair procedures and precautions step instructions

difference between floating and trunnion mounted ball valve

Difference between floating and trunnion mounted ball valve

Starting from the float is floating and floating ball valve is floating, it is this attitude, usually starting with a small-caliber float, so the large-diameter ball type should be floating instead of Q47 Q41F

Two kinds of layout is not the same ball, the ball valve also has a floating lower floating shaft, valve switching process, the ball is around the vertical axis transformation, the sky is not the lower part of the float valve shaft. 200 caliber usually less use from the float valve, 200 caliber above are floating ball.

First, since the floating ball valve

The ball valve is floating from under medium pressure effect, the ball can occur and must be pressed in the displacement of the sealing surface of the outlet end, the outlet end of the guarantee seal.

From the float valve layout simple, good sealing, but the ball accepting jobs medium load all pass the exit ring seal and thus need to think about whether the information is maintained suffered job load media sphere. This layout is widely used in the low-pressure valve.

Second, floating ball valve

The ball valve is floating, the move does not occur after compression. floating ball valve with both starting floating valve seat, by the media pressure, moving the seat occurs, the seal is pressed onto the ball, in order to guarantee the seal. Usually with the ball, the lower shaft with bearings, operating torque is small, suitable for high pressure and large diameter valve.

To cut valve operating torque level and add reliable seal these years and presents the valve seals, both pressure injection of a special lubricant between the sealing surface to form a layer of film that enhances the seal, but also reduce operating torque , more suitable for large diameter high pressure valve.

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