18'' Class 900 ISO 5211 3pc Trunnion Ball Valves

Product Introduction

The 18‑inch Class 900 ISO 5211 3‑Piece Trunnion Ball Valve is a high‑performance quarter‑turn valve engineered for demanding industrial applications. Designed with a three‑piece bolted body construction and trunnion‑mounted ball design, this valve provides reliable, tight shut‑off with low operating torque even under high pressure. With ISO 5211 actuator mounting pad, it is ready for direct actuation or gear drive installation. Built to industry standards such as API 6D and ASME B16.x, it is ideal for oil & gas, chemical, power generation and other heavy‑duty environments.

Product Specifications

Applicable Standards:
Ball  Valve design according to API6D,BS5351,ASME B16.34
Face to face ASME B16.10,AP6D
End Flanges ASME B16.5/ASME B16.47
Butt welded ends ASME B16.25
Fire Safety API607,API6A
Inspection and test API 598,API6D

Material: LF2
Size Range: 2"~48"
Pressure Rating: ASME CL, 150, 300, 600

Design Description:
- Structure : 2 pieces or 3 pieces body
- High shut-off sealing mechanism and low torque operation
- Block and bleed function
- Self-cavity pressure relief
- Fire safe design
- Blow out proof stem construction
- Anti-static design
- Locking device (for lever handle operation)
- ISO 5211 actuator mounting
- Emergency grease injection (option)
- PN design can be available

Advantages

• Reduced operating torque & ease of actuation: Thanks to the trunnion‑mounted ball design, torque requirements are lower compared to floating ball valves of the same size/pressure.

• Enhanced durability and long service life: The solid support of the ball and robust body design reduce seat and bearing wear, extending valve life in harsh conditions.

• Maintenance‑friendly design: The three‑piece body allows access to the internals (ball, seats, stem) without removing the full valve from pipeline—minimizing downtime and replacement costs.

• High reliability in critical applications: With features like fire‑safe design, anti‑static protection, double block & bleed, the valve meets rigorous standards for oil & gas, chemical and power industries.

• Automation‑ready: With ISO 5211 mounting pad and options for gear operator or actuators, the valve integrates easily into automated process systems.

• Customizable materials and options: Ability to select body/trim materials, end connections, seat types, coatings, etc., allows tailoring to specific media (e.g., sour gas, corrosive fluids) and temperature/pressure regimes.

• Large‑diameter suitability: At 18″ size and Class 900 rating, the valve is particularly well suited for major pipeline systems or large‑flow applications where reliability and performance matter.
  
  

FAQ 

Q1: What is the difference between ISO 5211 mounting and other actuator mounting standards?
A: ISO 5211 is an international standard specifying dimensions for actuator mounting pads. It ensures that electric, pneumatic, or hydraulic actuators can be installed directly without custom adapters, simplifying automation integration.

Q2: Can this valve handle abrasive or slurry media?
A: Yes, the trunnion-mounted design and optional hardened seat or ball coatings make the valve suitable for abrasive or slurry applications. Seat replacement is straightforward due to the three-piece design.

Q3: How does this valve achieve bubble-tight shut-off?
A: The trunnion-mounted ball design anchors the ball firmly, ensuring even seat contact. Combined with high-quality seat materials, this allows zero-leak performance even under high pressure.

Q4: What maintenance is needed for long-term performance?
A: Routine inspection of seat and stem, periodic lubrication of stem bearings (if applicable), and checking for external leakage is sufficient. The three-piece body allows maintenance without removing the entire valve from the pipeline.

Q5: Can this valve be used in emergency shut-off applications?
A: Absolutely. The low torque and quick quarter-turn operation make it ideal for rapid isolation in critical pipelines. Fire-safe and double block & bleed options enhance safety in emergency scenarios.