Trunnion Ball Valve

STANDARD APPLICATIONS:

BODY CONSTRUCTION:

Side Entry, Bolted Body, 2Pieces or 3 Pieces Body;

Top Entry Trunnion Ball Valve

Welded Body Ball Valve

BODY MATERIAL:

Carbon Steel, Stainless Steel, Low-Temperature Carbon Steel, Duplex, Super Duplex, Al Bronze, Inconel etc.

SEAT MATERIAL:

Soft Seat: PTFE, Nylon, PEEK, PPL, Delrin, Devlon etc.

Metal Seated: Stellite, Tunsten Carbide, Chrome Carbide

BALL MATERIAL:

ENP, Stellite, Tunsten Carbide, Chrome Carbide

OPERATOR

Manual: Lever, wrench or Gear

Actuated: Pneumatic/ Hydraulic/Electric

HOW A TRUNNION BALL VALVE WORKS

The trunnion ball valve is a form of quarter-turn ball valve which uses a solid, perforated and fixed/supported/trunnion mounted ball to control flow through it. The line pressure drives the upstream seat against the stationary ball so that the line pressure forces the upstream seat onto the ball causing it to seal. The mechanical anchoring of the ball absorbs the thrust from the line pressure, preventing excess friction between the ball and seats, so even at full rated working pressure operating torque remains low. This is particularly advantageous when the ball valve is actuated because it reduces the size of the actuator and hence the overall costs of the valve actuation package.

GENERAL FEATURES:

1. Antic-Static Device: anti-static spring is used as standard between the stem and the ball.

2. Anti blow-out proof stem design.

3. High quality stem gasket for reliable tightness and low emission performance.

4. Use of low seat-ball friction materials and surface finish for reliable sealing and long service life.

5. Low operation torque design.

6. Emergency sealant injection system for ball valve size 6”and larger (or smaller size on request), is equipped with sealant injection located at stem and seats area.

7. Standard double block & bleed seat (DBB)

8. Double isolation & bleed (DIB) under request

9. Fire safe design to API 607/API 6FA

10. PMSS - Primary metal seated, secondary soft seated with differential hardness between the ball and seat to prevent galling of the substrate

Double Block and Bleed Seat (DBB)

API 6D definition: DBB valve is single valve with two seating surfaces that, in the closed position, provides a seal against pressure from both ends of the valve, with a means of venting/bleeding the cavity between the seating surfaces.

Double block and bleed seats (DBB) are generally internal self relieving seat.

Double Block: When the ball is in the closed position, each seat seals off the process medium independently at the same time between the up/down stream.

Bleed: When the ball is in closed position and the pressure rating of the trapped medium gets 1.33 times of the line pressure, the trapped medium gets released between seat automatically.

The trunnion mounted ball valve may trap the media in the body cavity when the operator closes the valve. The trapped fluid expands and the pressure increases in the cavity when heated. If the cavity pressure gets 1.33 times of the line pressure, the trapped fluid will push the seat of the downstream side away from the ball by rising pressure against the spring load. When this happens, the pressure gets released.

Double Isolation & Bleed (DIB)

API 6D definition: "DIB valve is a single valve with two seating surfaces, each of which, in the closed position, provides a seal against pressure from a single source, with a means of venting/bleeding the cavity between the seating surfaces. "

DIB ball valves are made of double piston effect seat. Each seat is to be pushed against the ball in both cases, whether pressure comes from body cavity or from upstream/ downstream side.

DIB-1 (DPE*DPE Seats)

DIB-1 ball valves are are combined with two piston seats. If one seat is broken, the other seat can still cut off the flow from both ends. Ball valve with two DPE seats cannot perform cavity relief. For such reason -in liquid services- the use of a relief valve is recommended to relieve the pressure to atmosphere.

Double Isolation & Bleed (DIB-1), Both Seats are DPE Seats

DIB-2 (DPE*SPE Seats)

Upstream SPE seat ensures self relieving capability, while downstream DPE seat grants the double barrier in case of upstream seat damage. This configuration involves a preferred direction of installation with SPE seat facing upstream. With SPE-DPE configurations, cavity relief always takes place through SPE seat.

DIB-2, One Seat is DPE, the Other Seat is Single Piston Effect

Trunnion Ball Valve Price List - Jan. 2021

Note: 1. The price is for trunnion mountd ball valve, dbb, side entry, bolted body, design to API 6D, forged steel A105 body, 316 trim, RPTFE seat for Class 150-300, Devlon/Nylon seat for Class 600, PEEK seat for Class 1500.

2. The price list is for reference only, the price is changing due to a lot of factors, such as raw material cost, the accurate price will be based our offical quotation.

Side Entry Trunnion Ball Valve Drawing

Material Specifications

DIMENSION & WEIGHT

Note:

1. End to end dimensions is L , bore size is d in above dimension drawing.

2. End to end/face to face dimensions are as per API 6D.

Class 150 Ball Valve Dimension & Weight, Full & Reduced Bore, Long Pattern - API 6D

Class 300 Ball Valve Dimension & Weight, Full & Reduced Bore, Long Pattern - API 6D

Class 600 Ball Valve Dimension & Weight, Full & Reduced Bore, Long Pattern - API 6D

Class 900 Ball Valve Dimension & Weight, Full & Reduced Bore, Long Pattern - API 6D

Class 1500 Ball Valve Dimension & Weight, Full & Reduced Bore, Long Pattern - API 6D

Class 2500 Ball Valve Dimension & Weight, Full & Reduced Bore, Long Pattern - API 6D