Pneumatic High Pressure Ball Valves

Forged Trunnion-Mounted Series (Class 600–2500)

Engineered for high-pressure mainline pipelines (DN50 to DN300 / 2" to 12"). Fixed upper and lower trunnion plates absorb massive hydrostatic line thrust, dramatically reducing operating break-away torque and preventing seat deformation under extreme pressure differentials.

• Double Block and Bleed (DBB) capability per API 6D
• Spring-energized self-relieving seats (Single Piston Effect - SPE)
• End connections: ASME B16.5 RTJ (Ring Type Joint) & RF flanges

Hydraulic High-Pressure Block Series (Up to 50 MPa)

Built from solid-forged rectangular steel blocks for high-pressure hydraulic test benches, water jetting skids, and CNG dispensing manifolds (DN10 to DN50 / 1/4" to 2"). Precision Delrin (POM) or PEEK seats guarantee bubble-tight zero leakage at up to 500 bar working pressure.

• Ultra-compact solid forged carbon or 316 stainless body
• High-pressure NPT, SAE 4-bolt flange, or BSPP threaded ports
• Fast sub-second pneumatic cycling for high-frequency hydraulic test skids

100% Forged Steel Body Metallurgy

Manufactured exclusively from forged materials (ASTM A105, F316, F51 Duplex) rather than sand castings. High-density forged grain structure eliminates internal gas voids, shrinkage cracks, and structural micro-porosity under 420+ bar hydraulic stress.

Trunnion Low-Torque Engineering

Heavy-duty upper and lower trunnion plates anchored in composite bearings absorb full hydrostatic line loads. This ensures consistent low operating torque during cycling, allowing compact, economical pneumatic actuator sizing.

PEEK, Devlon & Metal Hard-Faced Seats

Configured with high-modulus virgin PEEK or Devlon V-API seats for bubble-tight Class VI shut-off up to Class 1500. For Class 2500 abrasive or steam service, supersonic HVOF Tungsten Carbide (WC-Co) metal-to-metal seating resists erosion.

Sub-Second Emergency Shutdown (ESD)

In high-pressure gas headers, delayed valve closure can cause pipeline rupture. Our spring-return pneumatic scotch-yoke actuators snap heavy valves shut in under 1 second, delivering certified SIL 3 safety integrity.

Double Block & Bleed (DBB) Isolation

Dual spring-loaded floating seat rings create independent upstream and downstream seals simultaneously. A body cavity bleed plug allows plant operators to verify zero leakage across both seats while the pipeline is operating under full live pressure.

Anti-Blowout Stem & Dual O-Ring Seals

Internally assembled one-piece forged blow-out proof stem incorporates heavy thrust bearing collars and secondary Viton/AFLAS O-ring packings. Completely eliminates hazardous stem ejection risks under catastrophic line pressure surges.

1. Why is a scotch-yoke pneumatic actuator preferred over rack-and-pinion for high-pressure valves?

Rack-and-pinion actuators produce flat, linear torque across the entire 90° stroke. High-pressure ball valves require massive break-away torque at the start and end of travel to unseat and seat the ball against high differential line pressure. AW series scotch-yoke actuators generate a distinct parabolic (U-shaped) torque curve, delivering up to twice as much torque at the start and end positions, matching valve seating requirements perfectly while saving air consumption.

2. Why is trunnion mounting mandatory for high-pressure ball valves above Class 600?

In a floating ball valve, line pressure pushes the entire ball against the downstream seat. At pressures exceeding 100 bar, this lateral hydraulic load creates massive frictional binding that crushes soft seats and requires colossal actuator forces. Trunnion-mounted designs anchor the ball securely on upper and lower mechanical bearing shafts, absorbing the hydraulic thrust mechanically so the seats only provide sealing contact, keeping operating torque low and consistent.

3. When should RTJ (Ring Type Joint) flanges be specified over Raised Face (RF)?

For ASME Class 600 pipelines handling hazardous gas or volatile hydrocarbons, and for virtually all pipelines rated at Class 900, 1500, and 2500, RTJ flanges are strongly recommended. RTJ connections utilize precision-machined metallic octagonal ring gaskets (such as soft iron or 316SS) that deform elastically under bolt load into flange grooves, creating an indestructible metal-to-metal seal immune to blowout under extreme hydraulic surges.

4. How does the spring-return fail-safe mechanism function during a wellhead emergency?

In wellhead choke loops or gas compressor stations, catastrophic emergency conditions require instantaneous pipeline cutoff. When the safety ESD circuit de-energizes the pilot solenoid valve, high-pressure air in the actuator cylinder exhausts instantly through a quick exhaust valve (QEV), allowing heavy pre-stressed mechanical spring packs to snap the high-pressure ball valve shut in under 0.8 seconds.