2-Piece Trunnion Mounted Ball Valve c/w SA Pneumatic Actuator(ESD)
Description
2-Piece Trunnion Mounted Ball Valve Technical Data Sheet
(A105 Body / 316L Ball and Stem / 316L+PTFE Seat / Single-Acting Pneumatic Actuator / ESD Service)
Product Name: 2-Piece Flanged Trunnion Mounted Ball Valve (with Single-Acting Pneumatic Actuator)
Model: Q347F-600LB / PQ347F (Pneumatic)
Date: February 16, 2026
1. Product Overview
This valve features a 2-piece bolted body construction with trunnion mounted ball design, where the ball is supported by top and bottom bearings, making it suitable for high-pressure differential and large bore applications. The body material is ASTM A105 Carbon Steel, the ball and stem are 316L Stainless Steel, and the seats are 316L+PTFE (Polytetrafluoroethylene) composite. It is equipped with a single-acting pneumatic actuator (spring-return) specifically designed for ESD (Emergency Shutdown) service, automatically returning the valve to its preset fail-safe position (Fail-Close or Fail-Open) upon loss of air supply. Ideal for oil, gas, chemical, and other processes requiring high-reliability safety interlocking.
2. General Technical Specifications
| Item | Specification |
|---|---|
| Valve Type | 2-Piece Bolted Body Trunnion Mounted Ball Valve |
| Nominal Size (NPS) | 2″ ~ 24″ (DN50 ~ DN600) |
| Pressure Class | Class 150 / Class 300 / Class 600 / Class 900 (Optional) |
| Connection Type | Flanged Ends (ASME B16.5 RF / RTJ) |
| Structure Style | 2-Piece Bolted Body, Trunnion Mounted Ball |
| Temperature Range | -29°C ~ +180°C (-20°F ~ +356°F) (Depending on PTFE seat material) |
| Applicable Media | Natural Gas, Petroleum, Water, Steam, Corrosive Fluids |
| Design Standard | API 6D / ASME B16.34 |
| Face-to-Face Dimension | ASME B16.10 |
| Pressure Testing | API 598 / API 6D |
| Operation | Single-Acting Pneumatic Actuator (Spring-Return) |
3. Material of Parts Specification
| Part Name | Material / Grade | Material Properties & Application |
|---|---|---|
| Body | Carbon Steel (ASTM A105) | Forged carbon steel, high strength, suitable for high-pressure applications. |
| Bonnet | Carbon Steel (ASTM A105) | Same material as body for consistent strength and galvanic compatibility. |
| Ball | Stainless Steel (ASTM A182 F316L) | Low-carbon austenitic stainless steel, excellent corrosion resistance, surface hardened. |
| Stem | Stainless Steel (ASTM A182 F316L) | Same material as ball, blow-out proof design, corrosion resistant. |
| Seat (Sealing Face) | 316L Stainless Steel + PTFE | Metal seat body with PTFE (Polytetrafluoroethylene) insert, providing soft seal with zero leakage. |
| Seat Spring | Stainless Steel (Inconel / 17-7PH) | Provides pre-load to ensure sealing performance under low pressure. |
| Stem Bearings | PTFE / Reinforced PTFE | Self-lubricating, reduces operating torque. |
| Packing | Flexible Graphite / PTFE | Low fugitive emission design, complies with ISO 15848-1. |
| Gasket | Spiral Wound Gasket (SS+Graphite) | Suitable for high temperature and pressure applications. |
4. Single-Acting Pneumatic Actuator Specifications (ESD Service)
| Item | Specification |
|---|---|
| Actuator Type | Single-Acting Pneumatic Actuator (Spring-Return) – Rack & Pinion / Scotch Yoke |
| Action Mode | FC (Fail-Closed) or FO (Fail-Open) (As per ESD logic requirements) |
| Supply Pressure | 4 ~ 8 Bar (60 ~ 120 psi) |
| Control Method | Air Supply Control / Solenoid Valve Control (24V DC / 110V AC / 220V AC) |
| Solenoid Valve | Single-Coil Solenoid Valve (for ESD interlock), Explosion-proof option available (Ex d IIB T4 / Ex mb) |
| Position Feedback | Limit Switch Box (Mechanical or Proximity type) for remote valve position indication |
| Accessories | Air Filter Regulator, Quick Exhaust Valve (Optional), Lock-Up Valve (Optional) |
| Mounting Interface | ISO 5211 Standard Mounting Flange |
5. Main Technical Characteristics
-
Trunnion Mounted Design: The ball is supported by top and bottom stem bearings, preventing ball movement under high differential pressure, ensuring low and stable operating torque.
-
2-Piece Body Construction: The body consists of two main parts bolted together, facilitating easy maintenance and replacement of internal components.
-
Spring-Loaded Seats: Seats are equipped with springs providing initial pre-load, ensuring bi-directional zero leakage seal under both low and high pressure.
-
PTFE Soft Seal: Seat inserts utilize PTFE material, forming a soft seal with the ball achieving bubble-tight sealing (API 598 Rate A), ideal for critical shut-off applications.
-
Blow-Out Proof Stem: The stem is designed with a blow-out proof feature, ensuring it cannot be ejected by line pressure even under extreme conditions.
-
Anti-Static Device: An anti-static spring is fitted between ball and stem to dissipate static charges, preventing fire hazards from static accumulation.
-
Fire-Safe Design: Complies with API 607 / API 6FA fire-safe standards. In case the soft seat is destroyed by fire, the metal seat contacts the ball providing an emergency metal-to-metal seal.
-
Automatic Cavity Pressure Relief: The seat design allows automatic pressure relief from the body cavity in case of thermal expansion, protecting the valve body.
-
ESD Dedicated Actuator: Single-acting pneumatic actuator automatically returns the valve to its preset fail-safe position (Fail-Closed or Fail-Open) upon loss of air supply or control signal, meeting safety interlock requirements of Emergency Shutdown Systems (ESD) .
6. Principal Dimensions & Connection Data (Reference Class 600 RF)
Note: Final dimensions subject to approval drawings. Conforms to ASME B16.10.
| NPS | Face-to-Face L (mm) | Flange Diameter D (mm) | Bolt Circle Diameter K (mm) | No. of Bolt Holes n | Hole Diameter d (mm) | Approx. Height H (Open) (mm) |
|---|---|---|---|---|---|---|
| 2″ | 292 | 165 | 127.0 | 8 | 19 | ~450 |
| 3″ | 356 | 190 | 168.3 | 8 | 22 | ~550 |
| 4″ | 432 | 235 | 200.0 | 8 | 22 | ~650 |
| 6″ | 559 | 305 | 269.9 | 12 | 22 | ~850 |
| 8″ | 660 | 360 | 330.2 | 12 | 25 | ~1050 |
| 10″ | 787 | 420 | 387.4 | 16 | 29 | ~1250 |
| 12″ | 838 | 485 | 450.9 | 20 | 32 | ~1450 |
Note: Total height H includes actuator height and is for reference only.
7. Applicable Standards & Testing
-
Design & Manufacture: API 6D / ASME B16.34 / ISO 14313
-
End Flanges: ASME B16.5
-
Face-to-Face: ASME B16.10
-
Fire Test: API 607 / API 6FA
-
Low Fugitive Emission Test: ISO 15848-1 (Optional)
-
Actuator Mounting: ISO 5211
-
Pressure Tests:
-
Shell Test: 1.5 x Rated Pressure at ambient temperature
-
High-Pressure Seat Test: 1.1 x Rated Pressure at ambient temperature
-
Low-Pressure Pneumatic Test: 0.6 MPa (90 psi)
-
Inspection Standard: API 598 / API 6D
-
8. ESD System Integration Notes
-
Fail-Safe Position: Based on process safety requirements, the actuator can be configured as Fail-Closed (FC) or Fail-Open (FO) upon loss of air supply.
-
Response Time: Quick exhaust valves and speed control valves can be provided to meet ESD system closing/opening time requirements.
-
Solenoid Valve: Low-power solenoid valves (e.g., 1.8W) are recommended for direct interface with ESD safety PLCs.
-
Position Monitoring: Limit switch box provides digital signals (dry contacts) to DCS/ESD system for real-time valve status feedback.
9. Remarks
-
This valve is specifically designed for ESD Emergency Shutdown systems. The single-acting actuator ensures the valve automatically reaches the safe position upon loss of air supply.
-
The A105 body + 316L trim combination is suitable for moderately corrosive media such as natural gas, oil, and water.
-
PTFE seats have a maximum operating temperature of 180°C (356°F). For higher temperature applications, PEEK or metal-seated options should be considered.
-
Optional accessories include explosion-proof solenoid valve enclosures, positioners, and position transmitters to meet various control requirements.
