Trunnion Mounted Ball Valve

Trunnion Mounted Ball Valve

Trunnion mounted ball valves are designed in accordance with API6D or Customers Special Requested,Offering 2pc or 3pc body split construction side entry type. Including Soft Seated & Metal Seated according the medium and temperature,Choose and design suitable sealing material to customers,such valve can be used in working temperature range -196℃~ 500℃. Trunnion Mounted are optional designed with Double block and bleed or double piston type. Ball valves are equipped with sealant injection system for both stem and seats to allow external intervention to prevent seat or stem leakage with Gear Operator and Pneumatic Actuator and Electrical Actuator.All Trunnion mounted ball valves is fire safe test certified by DNV Register per API607 and API6FA,With Gear Operator and Pneumatic Actuator and Electrical Actuator.

Valve Range

Size ： 1/2”~56”（DN15~DN1400）

Rating ： 150~2500LB（PN16~PN420）

Body Materials ： Carbon Steel, Stainless Steel, Alloy Steel, Duplex Steel

Trim ： Carbon Steel, Stainless Steel, Duplex Steel

End Connection ：RF，BW 

Trunnion mounted ball valve is used to cut off or connect the media in various pipelines of Class150 Class2500. The valves made of different materials are suitable for various media such as water, steam, oil, liquefied gas, natural gas,coal gas, nitric acid, oxidizer, urea and etc. The driving modes include manual operation, worm and worm gear transmission,pneumatic operation and electric operation. The connection ends can be flange or butt welding.

Body Construction.

Two or three pieces bolted body construction designed for maximum rigidity against pipeline forces. Bolted construction allows easy service and on site maintenance.

BODY SEALING.

A primary positive sealing action of O-rings and a secondary fire-proof graphite gasket assure no leakage in all static body joints.

PRESSURE RELIEF (API 6D, 6.8).

All standard Trunnion ball valves shall be provided with self relieving seats allowing automatic body cavity relief exceeding 1,33 times the valve pressure rating at 38°C.

DRAIN SYSTEM.

Trunnion mounted ball valves have a drilled and threaded drain connection as per API 6D.

BLEED VALVE.

Trunnion mounted ball valves have a threaded vent anti-blow-out valve as per API 6D.

VALVE ENDS (API 6D,6.7).

Standard end flanges shall be furnished in accordance with ASME B16.5 for sizes up to and including DN 600 (NPS 24), except MSS SP-44 for DN 550 (NPS 22) and ASME B16.47 Series A for DN 650 (NPS 26) and larger sizes. Standard welding ends shall conform to ASME B31.8 and ASME B16.25.

SEATS, SEAT INSERTS & SEAT SEALINGS

On request, two other Trunnion mounted valve designs are available:

Double Position Effect Design

Bi-directional, twin seats valve (with two seats, both seats are bi-directional). This means valves designed for blocking the fluid in both downstream and upstream directions, with two seats, each sealing in both directions: from the valve ends to the valve body cavity and from the body cavity to the valve ends. This seats design improves the sealing capacity of the valve adding a seating surface in line, but an external safety relief valve is needed to allow the release of the cavity over-pressure.

DOUBLE BLOCK AND BLEED (DBB).

Trunnion mounted ball valve according to API 6D definition: valve with two seating surfaces which, in the closed position, blocks flow from both valve ends when the cavity between the seating surfaces is vented through a bleed connection provided on the body cavity.

UPSTREAM SELF RELIEVING DESIGN.

Uni-directional, twin-seat valve with the upstream seat uni-directional and the downstream seat bi-directional. This combination maintains the sealing capacity of the valve in the event of failure of the upstream seat. In addition, as the upstream seat automatically releases the body cavity over-pressure, no safety relief valve is needed for this purpose