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  • 736 6th Ave SW, Suite 1200, Calgary, AB T2P 3T7
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TRUNNION MOUNTED BALL VALVE

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TECHNICAL SPECIFICATIONS
DESIGN STANDARD API 608 / API 6D / BS 5351 / CSA Z245.15
SIZE RANGE 2” – 60”
FLOW BORE Full Bore / Reduce Bore
BODY STYLE 2-piece / 3-piece / Welded Body / Top Entry
PRESSURE RATING Class 150 – 2500
WORKING TEMPERATURE -45˚C ~ +220˚C (higher temperature & cryogenic applications available on request)
END CONNECTION ASME B16.5 - Flange (RF, RTJ) ASME B16.25 – Butt-Weld
FACE to FACE ASME B16.10
FIRE SAFE API 607 / API 6FA
TEST & INSPECTION API 598 / BS 6755 / API 6D

FEATURES

1. Reliable Seat Sealing Structure

Two floating seat retainers are used for the seat sealing. They float axially to seal against the ball. High-pressure sealing is realized by a pressure-assisted mechanism, while a pre-loaded spring ensures tight sealing under very low differential pressure in both soft and metal seated configuration.

The seat insert for soft-seated configuration is made of thermoplastic material with multiple options depending on the actual operating conditions.

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2. Fire Safe

VAHN-TECH (vt) Ball Valves are designed and manufactured to meet the requirements of API 607 & API 6FA and to prevent both internal and external leakage in the event of a fire.

Internal Leak Prevention: In case of a fire destroying the thermoplastic sealing, the ball will seal against the metal face of the seat retainer, providing a secondary metal-to-metal seal, preventing leak through the burnt seat. The flexible graphite seat retainer seal prevents leakage past the seat retainer.

External Leak Prevention: Secondary seals, including packing and O-rings, in the stem area or valve body joints are coupled with flexible graphite packing rings. The high temperature resistance of the graphite material will prevent external leakage in case of fire.

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3. Blow-Out Proof Stem

The one-piece stem design includes a step preventing blow out, even during maintenance operation or incidental cavity pressure rise.

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4. Antistatic Device

During on-off operations, friction between the ball and the non-metal seat can produce an electrostatic charge that can accumulate on the ball surface. Antistatic devices (ball loaded spring/springs) are assembled between stem and ball to permit electric conductivity through all metallic components to prevent static sparks.

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APPLICATIONS

Trunnion Mounted Ball Valves are used mainly in the following industries:

  • natural gas
  • oil
  • chemicals
  • metallurgy
  • urban construction
  • environmental protection
  • pharmaceuticals
  • foodstuff

The sulphur-resisting series are used mainly for highly corrosive natural gas pipelines containing hydrogen sulphide impurities.

Extended Bonnet and Cryogenic Application

VAHN-TECH (vt) can provide any size of ball valves with an extended bonnet for special installation requirements, such as buried service and low temperature and cryogenic applications.

VAHN-TECH (vt) cryogenic ball valves are suitable for LNG storage, tank applications, cryogenic pumps, pipelines or low-pressure trailers. The valves provide high flow capacity, tight shutoff, and long service-free life in extreme environmental conditions. Cryogenic ball valves are available in all sizes and pressure classes for operating temperatures from -196°C to +120°C.

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High-Temperature Application

VAHN-TECH (vt) provides metal seated ball valve design for high temperature and hot gas applications up to 550˚C /1022˚F. Special trims are selected to provide optimized resistance and sealing in an aggressive environment.

Tungsten Carbide/Chrome Carbide and Hard Graphite seated options are available. All gaskets and seals are metal and graphite-based types, which are suitable for high-temperature service. Precise machining and lapping of the ball and seat ensure best in class leakage tightness, solving inner leakage and outer leakage issues, including high pressure and abrasive media.