Trunnion Mounted Ball Valve / Cast Steel / Forged Stee

What is a trunnion mounted ball valve ?

Trunnion Mounted Ball Valve is mainly applied to natural gas, oil products, chemical engineering, metallurgy, city building, environment protection, pharmacy, and food industries, among which the anti-sulfur series are used for long delivery pipes of natural gas that contains hydrogen sulfide medium, a lot of impurity and corrosive substances.

Trunnion Mounted Ball Valve

design features

Trunnion Mounted Ball Valve , a full line product offering with valves ranging in 2"-42", ANSI classes 150LB - 2500LB, forged steel bolted or all welded body, close coupled trunnion block design for low operating torques, secondary seat sealant feature.Kojo API-6D valves are offered with self relieving seats or optional double piston sealing. Special seat compounds are also available. Each valve meets, API-6D, API 6FA and Nace requirements. Options include stem extensions, actuators, pipe pups and specialized coatings.

Trunnion mounted ball valves met all the requirements of API 6D as well as the other design codes;Minimum wall thickness comply with ASME B16.34. Valves are usually supplied with lever,gear box,actuator or bare shaft on customer request

  • ISO5211 platform design is adopted for the convenience of installing the actuator
  • Double block and bleed function
  • Anti-blow-out stem design
  • The pressure balancing hole is provided on the steel ball
  • The body is provided with a device for cleaning the valve cavity
  • Automatic pressure relief function
  • Fireproof and antistatic design
  • Sealant injection system for emergency seal
  • Multiple driving modes facilitate the realization of automatic control
  • Reliable stem seal and low operating torque. Metal hard seal seat can be made according to requirements


  • Design & Manufacturing Standard:API 608, API 6D, ASME B16.34,
  • Face to face:ASME B16.10 ,API 6D,DIN 3202
  • Flange Connection Size:ASME B16.5, ASME B16.47, DIN 2543~2550, ASME B16.25
  • Butt Welding Size:ASME B16.25.
  • Test and inspection: API 6D, API 598
Flanged Connection Cast Steel Trunnion Mounted Ball Valve
Flanged Connection Cast Steel Trunnion Mounted Ball Valve

Flanged Connection Cast Steel

Butt-Weld Connection Forged Steel Trunnion Mounted Ball Valve
Butt-Weld Connection Forged Steel Trunnion Mounted Ball Valve

Butt-Weld Connection Forged Steel

Welded Structure Trunnion Mounted Ball Valve
Welded Structure Trunnion Mounted Ball Valve structure

Welded Structure

Serial Model (K)Q41、(K)Q341、(K)Q641、(K)Q741、(K)Q841、(K)Q941
Pressure Grade Range PN1.6-10.0MPa CLASS 150-600
Nominal size DN15-200mm 1/211-811
Driving Manner and Scope of Application Handle driving PN1.6-10.0MPa CLASS 150-600
DN15-200mm 1/211-811
Worm gear operated PN1.6-4.0MPa PN6.4-10.0MPa CLASS150-300 CLASS400-600
DN150-200 DN80-100 611-811 311-411
Air-operating and fluid driving PN1.6-10.0MPa CLASS 150-600
DN15-200mm 1/211-811
Electric driving PN1.6-4.0MPa PN6.4-10.0MPa CLASS150-300 CLASS400-600
DN150-200 DN80-100 211-811 211-411

Construction of the shell

The valve bush of the stationary ball valve can be designed to three types:casting construction,forging construction,and full welding construction,according to user's demand or different working condition.And the ball valve of the full welding construction is mainly applied to underground operation.

Automatic pressure-relieving structure

When an abnormal rising of pressure appear in the hollow cavity,the single sealed-structure takes on the function of automatic pressure relieving,while the double-sealed structure can finish the job through a attached pressure-relieving device to the valve body.

Fire-resistant Structure

According to the operating condition and user requirement, a ball valve can be designed with a fire-resistant structure up to the fire-resistant standards of API607, API6FA and JB/T6899. Once the soft seal ring is burnt out on fire, the structure can avoid serious leaking of the medium and prevent the fire from sealing up.

Locking Device

A locking structure is designed on the full-open and full-close sports of manual ball valves to avoid abnormal open-and-close produce by the misoperation or unpredictable circuit vibration. On production lines of petroleum and chemicals of flammable mediums, and during the course of outdoor piping, the design is especially advantageous and practical.

Full Structure and Reduced Bore Structure

The two structure series are produced to meet different requirements of users. The passage inside the diameter of full diameter ball valves is the same as that of the valve pipe, which is convenient for pipe cleaning. The weight of retractive diameter ball valves is relatively lighter, but the fluid resistance is just 1/7 that of stop valves with the same caliber. Therefore, the application prospects of retractive diameter series are much better.

Anti-static Structure

While operating the valve, the friction between the sphere and the base will produce static charges accumulating on the sphere. To avoid static sparkle, the fire-resistant device is designed to derive the accumulated static sparkle, charges from the sphere.

The unique sealed Structure of Valve seat

Pre-ball sealed structure,post-ball sealed structure or pre-post-ball double sealed structures are available for choosing to different pressure,medium properties,and sealing requirements of the fixed ball valves.

Emergent repairman for the sealed structure

When leak was caused by damage on the valve seat or valve stick,the sealed grease injected through the grease feeding valve can seal the valve at once.

Jam and release

When the valve is closed,the valve seats will stop the affluence, and the precipitate in the can be released through the releasing device.

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