3-Piece Trunnion Ball Valves — 20″ 600LB RF

Description

3-Piece Trunnion Ball Valves — 20″ 600LB RF (Casting Body)

TECHNICAL DATA SHEET

1. General Description

This is a 20-inch, Class 600, three-piece side-entry, trunnion-mounted ball valve with raised face (RF) flanged ends. The valve body is of cast construction. The trunnion design absorbs thrust loads on the ball through trunnion bearings, significantly reducing operating torque and making it ideal for high-pressure, large-bore isolation applications. The three-piece design allows in-line maintenance: the center body with internals can be removed without dismounting the pipe flanges.

2. Applicable Standards & Codes

Item Standard / Code
Design & Manufacture API 6D / ASME B16.34
Pressure-Temperature Ratings ASME B16.34
Face-to-Face API 6D / ASME B16.10 (Long Pattern)
Flanged Ends ASME B16.5 (Raised Face)
Fire-safe Design API 607 / API 6FA
Inspection & Testing API 6D / API 598
Body Material Cast (ASTM A216 WCB, CF8M, etc.)
3. Main Technical Parameters

Parameter Description
Nominal Size 20 inch (DN 500)
Pressure Class Class 600
Body Material ASTM A216 WCB (standard; optional CF8/CF8M/LCB)
End Connection Raised Face Flange (RF) per ASME B16.5
Configuration 3-piece side-entry, trunnion-mounted ball
Ball Bore Full bore (standard) / Reduced bore
Operation Gearbox (manual, standard); electric/pneumatic actuator optional
Flow Direction Bi-directional
Service Media Water, oil, natural gas, non-corrosive fluids
Operating Temp. Range -29 °C to 200 °C (PTFE seats; higher with PEEK/Devlon)
Hydrostatic Test Pressure (ambient) Shell: 15.3 MPa.g; Seat: 11.2 MPa.g
Leakage Class API 6D zero leakage (soft-seated PTFE)
4. Typical Bill of Materials

No. Part Name Material Remarks
1 Body (Center Section) ASTM A216 WCB Cast
2 Side Bodies (Left/Right) ASTM A216 WCB Cast
3 Ball ASTM A105 + ENP / A182 F316 Electroless nickel plated
4 Seat Ring PTFE / Reinforced PTFE PEEK, Devlon available
5 Stem ASTM A276 410 / A182 F6a Anti-blowout
6 Seat Support Ring ASTM A105 + ENP Spring-loaded
7 Trunnion Bearings 316SS + PTFE Lining Self-lubricated
8 Stem Bearings 316SS + PTFE Lining Low friction
9 Bonnet/Body Bolts ASTM A193 B7 / A194 2H Corrosion protected
10 Packing Flexible Graphite / PTFE braided V-ring set
11 Gear Operator Cast iron/steel housing With mechanical stops
12 Flange Gaskets Reinforced Graphite / PTFE
5. Approximate Dimensions & Weight

Based on full bore, long pattern, gearbox operated. Final certified drawing governs.

Specification Unit Value
Nominal Size inch (mm) 20 (DN500)
Face-to-Face (L) mm 1397
Max. Body Outer Diameter mm Approx. 860
Center to Top Height (H) mm Approx. 1850 (with gearbox)
Gearbox Handwheel Dia. mm Approx. 700
Flange OD (Class 600, 20″) mm 813
Flange Bolt Circle mm 743
Approx. Total Weight kg Approx. 5,100
6. Design & Manufacturing Features

3-Piece Side-Entry Construction: The center body can be removed independently for servicing seats and seals without removing pipe flanges.
Trunnion-Mounted Ball: Fixed trunnion absorbs thrust loads, minimizing stem and seal friction for low torque and superior large-bore performance.
Double Block & Bleed (DBB): Dual seats with body cavity vent/drain. Allows independent sealing verification and cavity depressurization.
Anti-Blowout Stem: Stem with integral shoulder, internally loaded; prevents stem ejection per API 6D requirements.
Fire-Safe Design (Optional): Metal secondary seat provides metal-to-metal sealing after soft seal burn-out, compliant with API 607/6FA.
Low-Maintenance Packing: V-ring live-loaded packing self-adjusts for long life and low friction.
Cast Body: Fully NDE inspected (RT/UT) to ensure integrity; cost-effective for large sizes.
7. Pressure-Temperature Ratings Reference

(ASME B16.34, WCB body, PTFE seats, Class 600)

Service Temperature (°C) Max. Allowable Working Pressure (MPa.g)
-29 ~ 38 10.21
100 8.18
150 7.25
200 6.48
232 (max for PTFE) 5.80
Note: WCB material allows up to 427 °C per B16.34; PTFE limits use to ~200 °C. Select PEEK, Devlon, or metal seats for higher temperatures.

8. Inspection, Testing & Documentation

100% API 6D pressure tests: Shell (1.5× rated), high-pressure seat (1.1×), optional cavity relief and low-pressure air seat tests.
Cast body chemical and mechanical reports provided; RT/UT/PT NDE reports available.
Standard docs: Material certs, test reports, CoC, I&M manual. EN 10204 3.1 upon request.
Carbon steel bodies painted with anti-rust; flange faces protected.
9. Typical Applications

High-pressure oil & gas transmission line block valves
Refinery & petrochemical high-pressure product storage and metering
Medium/high-pressure water treatment and chemical injection
Power plant high-pressure feedwater and steam isolation (temp. limited by seat)
Natural gas high-pressure gathering and processing
10. Additional Selection Notes

Seat Material: Standard PTFE for -29~200 °C. Specify reinforced PTFE, PEEK, or metal seats for higher temperatures or abrasive media.
Bore Type: Full bore is standard. Reduced bore may be offered for cost reduction.
Actuation: Gearbox is standard. For electric/pneumatic actuation, provide control details, stroking time, and area classification.
Cavity Vent/Drain: Standard on trunnion ball valves, enabling online pressure equalization.
Mating Flanges: If companion flanges, gaskets, and bolts are required, please specify flange standard and material.