BALL VALVE
Trunnion Ball Valve
Application
Trunnion ball valves are suitable for use on various kinds of pipelines of Class 150~Class 2500,PN16~PN160,JIS10K~JIS20K to cut off or turn on the pipeline medium, of which the operation types include worm gear, manual, pneumatic or electric actuators, being เท general of flange connection, and butt welding ends connection as well.
Typical Drawing Of Trunnion Ball Valve And Parts Composition
Parts And Material List
Note: The chart above only lists out some common composition of steel ball valve parts. We may provide other different parts material composition according to the customer’s request or the actual valve working condition.
Design features of trunnion ball valve
Urgent Grease Injection Device
According to customers’ requirement, the trunnion ball valves made by SUNGO company are provided with devices for urgent grease injection,which are on both the stem and seat for the trunnion ball valves of DN 150mm(NPS6), and เท the body cavity for the valve of DN 125mm. When the o ring of stem or the body seat ring is damaged due to accident, the medium leakage between body and stem can be prevented by injecting the sealing grease through the
Double-block And Bleed Functions
In general, SUNGO’s trunnion ball valve features the front ball sealing design structure. Each seat of the ball valve can separately cut off the medium at both inlet and outlet of the valve to realize double-block functions. When the ball valve is closed, body cavity and two of the body ends can be blocked with each other even if both the inlet and outlet are under pressure, when the medium left in the body cavity might be bled through the relief valve.
Fire Safe Design
With the valve heated in a fire application, the non-metal material parts such as seat sealing ring of PTFE, o ring for the stem,and sealing gasket for body and bonnet, might be damaged due to high temperature.SUNGO’s special design of auxiliary metal to metal or the graphite seal is provited for the trunnion ball valv to effectively prevent both internal and external leakage of the valve. As required by customers, SUNGO’s fire safe design for the trunnion ball valve meets the requirement of API 607. API 6Fa, BS 6755 and JB/T 6899.
Self-relief In The Body Cavity
As the liquid medium left in the body cavity gasifies due to increased temperature, the pressure in the body cavity becomes abnormally higher, when the medium itself in the cavity would propel the seat and self-relieves the pressure to ensure the safety of valve.
Trunnion ball valve with the Bi-sealing design structure,i.e. seat sealing In front of the ball and seat sealing behind the ball
According to some special working conditions and customers’ requirement, SUNGO has provided the trunnion ball valve with the Bisealing design structure, i.e. seat sealing in front of the ball and seat sealing behind the ball, thus the reliable sealing of the valve is ensured because the valve can perform normally even if one of the effective sealing designs becomes lost due to the abnormal condition. Regarding the seat in front of the ball, the piston effect formed by the area difference between D1 and D2, plus the pre-tightened force of a spring would cause the seat In front of the ball by the pressure difference of the medium before and after the valve to touch the ball closely to form the tightness, of which the sealing force will become bigger as the pressure difference gets higher.
Regarding the seat after the ball, the piston effect formed by the area difference between D2 and D3, plus the pretightened force of a spring would cause the seat behind the ball to touch the ball closely to form the tightness, of which the sealing force will become bigger as the pressure difference gets higher.
Blow-out Proof Stem
Blow – out proof structure is provited with for the stem, which is positioned by the up – end cap and screw, being guaranteed not to be blown – out by the medium even if at abnormal risen pressure in the cavity.
Anti-static Design
The ball of the trunnion ball valve gets close contact with each othe through the trunnion, adjusting cushion, and down-end cap, the passage of static electricity thus forms together with the valve, which may lead the static electricity caused by sparks generated by friction between the ball and seat during on and off performance to the ground to prevent the possible risk of fire or explosion.
Mounting Pad Provided
SUNGO company has provided for trunnion ball valve with a mounting pad for fixing the actuators, such as worm gear, pneumatic, electric, hydraulic, and pneumatic&hydraulic acturtors.
Main Size And Weigth
In addition to the full bore floating ball valve,SUNGO company is also manufacturing the floating ball valve with reduced bore to satisfy different requirement of customers, which can not only lower the cost and the pricing, but also meet customers’ special requirement.
Note:1. RF indicates rased flange, RFJ means ring joint flange, and BW is butt welding ends connection.
2. Flange dimensions of the above table for valves of NPS 24 conforms to ASME B 16.5
3. For valves of NPS 26, the flange dimensions of above table conforms to B series of ASME B16.47 and API 605. As required by customers, flange dimensions rnay also conform to Aseries of ASME B16.47 and MSS-SP-44
Forged steel Trunnion Ball Valve
SUNGO company manufactures in general trunnion ball valve of casted steel valve body. However, if required by customers, forged steel valve body is also available, of which the flange dimensions and face to face dimensions are the same as that of cast steel trunnion ball valve.
Ball Valve With Reduced Bore
Except for full bore ball valves, SUNGO company manufactures also the ball valve with reduced bore to meet different requirement of customers, which not only lowers the cost and pricing, but also satisfies the special requirement of customers.
Note: Flange dimentions of ball valve with reduced bore are the same as that of full bore ball valve.