Trunnion ball valve

Trunnion mounted ball valve introduction

Trunnion mounted ball valve is a new generation of high-performance ball valve, suitable for long - distance pipeline and general industrial pipeline, its strength, safety, environmental resistance and other special considerations in the design, Trunnion mounted ball valve is suitable for a variety of corrosive and non-corrosive media.Compared with the floating ball valve, the fluid pressure in front of the sphere of all is passed to the bearing force, Trunnion mounted ball valve will not make a sphere to the seat to move, so the seat of Trunnion mounted ball valve will not bear too much pressure, so Trunnion mounted ball valve torque is small, the seat of the small deformation, stable sealing performance, long service life, applicable to high pressure, large diameter.Advanced spring-loaded pre-seat assembly with self-tightening features for upstream sealing.Each valve has two seats and can be sealed in each direction, so the installation has no flow restriction and is bidirectional.

Trunnion mounted ball valve has two block type and three block type body structure, the middle flange is bolted, the seal is made of reinforced teflon inset into the stainless steel ring, there is no spring at the back of the ring to ensure the seat is close to the ball, keep the seal.There is no PTFE bearing on the upper and lower stem to reduce friction and save effort in operation. There is no adjusting plate at the bottom of the shaft to ensure the connection between ball and seal ring.Full size: Trunnion mounted ball valve flow aperture is the same as the pipeline diameter for cleaning.
 
Suitable medium: water, gas, oil, natural gas and caustic medium.
Applicable temperature: -196 ~ 350℃
Driving mode: manual, pneumatic, electric, hydraulic, etc.
Nominal diameter: DN25-800,1" ~ 32"

Trunnion mounted ball valve working principle

The ball of Trunnion mounted ball valve is fixed and supported by two fixed shafts connected to the ball.When Trunnion mounted ball valve closed, there is no displacement of the ball due to the pressure of the medium. The upper and lower shafts connected with the ball are usually equipped with rolling bearings or sliding bearings.In order to reduce the opening and closing of the journal friction.Reduce operating torque.Trunnion mounted ball valve is suitable for large diameter ball valves.The ball of hard sealed Trunnion mounted ball valve is fixed by upper and lower stem.During operation, the fluid pressure will not cause the ball to move towards the seat, and the seat will not be subjected to excessive pressure and deformation.The stem is provided with self-lubricated bearing to reduce friction, the switch has small twist distance, and both seats are pretightened with spring.The sealing is made of polytetrafluoroethylene inserted into the steel solid, and the rear of the steel ring is provided with a spring to ensure that the seat is closely attached to the ball.When the pressure in the valve chamber rises abnormally beyond the spring jacking force, the Trunnion mounted ball valve seat falls back away from the ball to achieve automatic pressure relief effect, and the seat is automatically restored after pressure.The advanced structure makes the sealing performance of Trunnion mounted ball valve stable and labor-saving, and the service life is long. Trunnion mounted ball valve is extremely suitable for the long transmission pipeline and the general pipeline.
 

Trunnion mounted ball valve structure feature

1. Unique seat sealing structure
Trunnion mounted ball valve seat is designed with a front seal design, which has a two-way seal and an automatic pressure relief function in the middle chamber.The sealing seat inlaid with sealing material is floating and it is made of shells Spring loading ensures that the sealing surface is in close contact with the ball at all times to ensure that the valve can achieve leakage sealing under high and low pressure differences.
2. Automatic pressure relief structure
When the pressure in the middle cavity rises abnormally, the Trunnion mounted ball valve with single sealing structure has the automatic pressure relief function, while the ball valve with double sealing structure has the additional on the body Pressure relief device to relieve pressure.
3. Sealed emergency rescue function
Trunnion mounted ball valve is designed with an auxiliary seat emergency sealing system.Once the sealing surface is damaged, the corresponding sealant can be injected through the auxiliary sealing system for emergency rescue, the seat area can also be washed and lubricated through the auxiliary system if necessary.
4. Anti-static device
When operating Trunnion mounted ball valve, electrostatic charges are generated and accumulate in the ball row due to friction between the ball seats.In order to prevent the generation of electrostatic sparks, especially on the Trunnion mounted ball valve Set anti - static device, the generated static export (please contact our salesman for details).
5. Fire safe structure
Trunnion mounted ball valve seat with a unique structure, in case of fire, non-metallic sealing material burned, the metal ring with the spring of the spring to push the seat Seal with sphere to prevent fire spread and media outflow.(fire resistant structures are designed in accordance with API607, JB/T6899 and BS755)
6. Full bore structure and reduced bore structure
In order to meet the needs of customers, we has full bore Trunnion mounted ball valve series and reduced bore Trunnion mounted ball valve  series, full bore ball valve pipe diameter and pipe diameter consistent, easy to clean, etc.Reduced bore ball valve is light weight, its fluid resistance is only a part of the same diameter globe valve, the prospect is relatively broad.
7. Relief device of ball valve body
Discharge valves can be installed on the body of the ball valve according to the requirements of customer installations.Once both ends of the valve are closed, the overstock in the Trunnion mounted ball valve chamber is vented through the valve body's drain valve.
8. Extended stem device (optional)
For the buried Trunnion mounted ball valve, the extension device can be provided, including stem, grease valve, discharge valve, etc.Extension height (length generally refers to the distance from the center of the Trunnion mounted ball valve passage to the center of the operating device)

Trunnion mounted ball valve classification

 According to the operation:Pneumatic trunnion mounted ball valve,Electric trunnion mounted ball valve,Hydraulic trunnion mounted ball valve and Manual trunnion mounted ball valve;
According to the seat material:Soft seated trunnion mounted ball valve,Metal seated trunnion mounted ball valve;
According to the connection:Flange end trunnion mounted ball valve,weld end trunnion mounted ball valve;
According to the Material:Stainless steel trunnion mounted ball valve,carbon steel trunnion mounted ball valve,forged steel trunnion mounted ball valve and alloy trunnion mounted ball valve;