Trunnion Mounted Ball Valve Brochure

A.Double block and bleed function

 trunnion mounted ball valve generally use front ball sealing design structure. Two seats can separately blocks the media of the inlet and outlet to achieve double isolation.When the ball valve is closed,even apply pressure on both inlet and outlet of the valve,the body cavity and channels are biocked,the remaining media in the body cavity can be released.

When the liquid contained within the body cavity gasify due to temperayure increased and cause abnormally high pressure.the medium in cavity can be released by pushing

the seat by its acting force to ensure the safety of the valve and pipeline

 trunnion mounted ball valve can supplies a Selective design of double ways sealing structure.The two Seats can separately blocks the medium both in the inlet And outlet,they can also block the medium of cavity,which can achievethefunction of double isolation.When the valve is closde,the medium of inlet,outlet & cavity will be isolated,the outlet also ensure the sealing when the inlet seat leakage,so the valve has two double sealing function.

B.The manual and automatic pressure relief of body cavity

The remainde medium can be manuai released by the bleed valve,when the liquid medium containde within the body cavity gasify due to temperature incrased and cause abnormally high pressure,the sadety calve will open automatically when the medium pressure beyond the set value to ensure the safety of the valve and pipeline.

O-ring seals and metal graphite wound gasket are installed in the sealing paets of TIPVALVE ball valves,where there is a fire hazard and sealing elements like seat sear rings ,sealing gasket, O-ring seals made from non-metal materials like rubber, teflon etc.are damaged,the external metal graphite wound gasket will provide supplementary sealing; when sealin rings of the seat are damaged,the metal seat will automatically combine with the ball into a metal sealing under spring thyust,which could effectively control the internal leakage and external leakages of valves .the valve design is fully in accordance with requirements of standards and regulations of API 607, APL6FA BS6755 and JB/T6899,it also has passed API 607 fire-prooftest.

The stem adopts blowout prevention structure.the stem with great lower end small upper end is located by upper end cover and bolt and the stem cannot be blown out by the medium even in the case of abnormal pressure in the valve cavity.

5.Antistatic design

The valve design meets the antistaic requirement by setting static-prevention springs and small balls between ball and stem stem and packing cover plates which maintain the electrical continuity in places between ball and stem stem and body and the staic electricity produced by frictions of switches of balls and seats is lead to the ground thus reduces risks of fire hazards or explosions etc caused by electrostatic sparks.

For DN150(nps 6)or above trunnion mounted ball valves there are sealing grease injecting devices installed on the stem and seats as for those DN125 or below trunnion mounted ball valves the sealing injecting device can be installed according to the customer requirements when the sealing ring of the O-ring seals of stem are damaged accidentally sealing grease can be applied through sealing injector to prevent leakage of medium through the sealing ring of the seat and stem.

7.Gas explosion prevention sealing ring

For the valve of cl900 or above used in gas medium selects anti-gas-explosion rubber seals to reduce the risk of damaging the rubber seals caused by sudden pressure relief.

Soft seal structure

Simole structure reliable sealing and wide application range low cost.

O-ring sealing structure:

Reliable sealing low torque it can meet the user’s requirement on high sealing reliability and low torque occasion.

Metal to metal structure:

Meet the working condition of the medium including particles and mainly replace the occasion not suitable for above two sealing methods.