Electric High Pressure Ball Valves

Forged Trunnion-Mounted Series (Class 600–2500)

Engineered for heavy-bore mainline pipelines (DN50 to DN300 / 2" to 12"). Incorporates fixed upper and lower trunnion plates that absorb massive hydrostatic line thrust, dramatically reducing operating break-away torque and preventing seat crushing 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 steel rectangular blocks for high-pressure hydraulic skids, CNG dispensing stations, and water jet cutting systems (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 forged carbon steel or 316 stainless body
• Threaded NPT, BSPP, or high-pressure SAE 4-bolt flange ports
• Direct ISO 5211 actuator mounting pad with zero-backlash drive

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-Mounted Low-Torque Stability

Heavy-duty upper and lower trunnion plates anchored in PTFE/bronze composite bearings absorb full hydrostatic line loads. This ensures consistent low torque during cycling, preventing motor stalls and allowing compact, economical 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.

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.

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.

Heavy-Torque Actuation with Safety Margin

High differential pressures demand substantial break-away torque. DELCO automated packages feature electric actuators sized with a minimum 35% torque safety margin, planetary gear reduction, dual torque limit switches, and manual declutch handwheels.

1. Why is a trunnion-mounted design 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 high pressures (such as Class 600 or 100 bar), this lateral hydraulic force generates extreme friction that crushes soft seats, causes galling, and creates massive break-away torque that can stall or damage actuators. 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.

2. What is the difference between PEEK and metal-to-metal seating in high-pressure valves?

Virgin PEEK (or Devlon V-API): High-strength thermoplastic seats that deliver ANSI Class VI bubble-tight shut-off for clean gas and hydrocarbon lines up to Class 1500 and temperatures up to 250°C.

Metal-to-Metal Hard-Facing: The ball and seat rings are coated with supersonic HVOF Tungsten Carbide (WC-Co) or Stellite 6. Essential for Class 2500 services, erosive fluids containing sand/particulates, and supercritical steam exceeding 300°C where soft polymers would degrade.

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 DELCO ensure electric actuators don't stall under cold high-differential start-up?

Under high differential line pressures, the break-away torque after extended idle periods can be 20% to 30% higher than normal running torque. DELCO calculates high-pressure actuator sizing using verified API 6D torque formulas and incorporates a minimum 35% safety margin. Our actuators feature high-starting-torque motors with planetary gear reduction, Belleville spring torque protection, and electronic torque limit sensors that prevent motor burn-out.