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Fully Welded Trunnion Ball Valve

1. Product overview

fully-welded-trunnion-mounted-ball-valve

A typical fully welded trunnion mounted ball valve, BW ends, gear operated, forged steel 3 piece split body.

 

 

The fully welded trunnion ball valve has a fully welded body which eliminates any possible leakage through body joints hence it is quite suitable for long-distance pipeline transport of oil & gas or low-emission required toxic media as well as buried/ underground service. Generally, Metals Valve’s fully welded ball valves are furnished with butt welding(BW) ends, either soft or metal seated. Flanged end connections RF or RTJ are available upon request. If the valve is used for underground service, extended stem and bonnet will be provided. In order to avoid the heat effect during installation/ welding, extended welding ends can be furnished and post weld heat treatment(PWHT) shall be carefully implemented. Serial Number: FWBV16. See the dimension & weight specifications of FWBV16.

2. Design features and material selection

Design standards: API 6D, ISO 17292, ASME B16.34; Size range: 2″~60″; Pressure ratings: 150LB~2500LB; End connection: ASME B16.5, ASME B16.25; Fire safe design to API 607, API 6FA, ISO 10497; Inspection and test: API 598, API 6D, EN 12266-1. The fully welded trunnion ball valves are designed to full port, forged steel 3-piece split body and side entry, either lever/gear or actuator operated.

Design Features

Design features of fully welded trunnion ball valve BW

Design features of fully welded trunnion ball valve, 3 piece split body, side entry, BW ends.

(1) T-shaped blow-out proof stem design.
(2) & (3) Sealant injection fittings to prevent stem or seat leakage in case the internal sealing fails.
(4) Fully welded construction eliminates any possible leakage from body connections.
(5) Fire safe metal to metal design for emergency seals once soft seating materials are disintegrated after fire.
(6) The seat is spring-energized to ensure low-pressure tightness.

Material Selection

G.A drawing of BW fully welded trunnion ball valve

The G.A drawing of fully welded ball valves, trunnion mounted, 3-pc split body, side entry, BW ends.

Stem and seat sealing - Zoom View

Stem and seat sealing – Zoom View

ItemPart NameCarbon SteelStainless SteelLow Temperature
1Drain PlugSS304SS304SS304
2BodyASTM A105NASTM A182 F316ASTM A350 LF2
3Body CapASTM A105NASTM A182 F316ASTM A350 LF2
4Grounding PlungerSS301SS301SS301
5Grounding SpringSS301SS301SS301
6StemASTM A105N+ENPASTM A182 F316ASTM A350 LF2+ENP
7Name PlateStainless SteelStainless SteelStainless Steel
8RivetStainless SteelStainless SteelStainless Steel
9ScrewASTM A193 B7ASTM A193 B8ASTM A320 L7M
10GasketSS316+GraphiteSS316+GraphiteSS316+Graphite
11ScrewASTM A193 B8ASTM A193 B8ASTM A320 L7M
12O-ringVITONVITONHSN
13Stem KeyCarbon SteelStainless SteelStainless Steel
14GearboxASTM A216 WCBASTM A216 WCBASTM A352 LCB
15Stem InjectionSS304SS304SS304
16Top FlangeASTM A105N+ENPASTM A182 F316ASTM A350 LF2+ENP
17Actuator StudASTM A193 B7ASTM A193 B8ASTM A320 L7M
18Actuator NutASTM A194 2HASTM A194 8ASTM A194 7M
19Gland CapASTM A105NASTM A182 F316ASTM A350 LF2
20Vent ValveStainless SteelStainless SteelStainless Steel
21Seat InjectionStainless SteelStainless SteelStainless Steel
22Trunnion PinStainless SteelStainless SteelStainless Steel
23Seat FollowerASTM A105N+ENPASTM A182 F316ASTM A350 LF2+ENP
24Seat SpringInconel X-750Inconel X-750Inconel X-750
25O RingVITONVITONHSN
26Seat RingASTM A105N+ENPASTM A182 F316ASTM A350 LF2+ENP
27Seat GasketPTFEPTFEPTFE
28Firesafe GasketSS316+GraphiteSS316+GraphiteSS316+Graphite
29Seat InsertNYLONNYLONNYLON
30BallASTM A105N+ENPASTM A182 F316ASTM A350 LF2+ENP
31Trunnion SupportASTM A216 WCB+ENPASTM A351 CF8MASTM A352 LCB+ENP
32Thrust WasherRPTFERPTFERPTFE
33BearingSS316+PTFE+MoS2SS316+PTFE+MoS2SS316+PTFE+MoS2
34Stem O-RingVITONVITONHSN
35GasketSS316+GraphiteSS316+GraphiteSS316+Graphite
36O ringVITONVITONHSN
37Thrust WasherRPTFERPTFERPTFE
38BearingSS316+PTFE+MoS2SS316+PTFE+MoS2SS316+PTFE+MoS2
The conventional material selection for forged steel fully welded ball valves, 3 piece body trunnion mounted, side entry, soft seated. Other materials are available upon request.

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Trunnion Mounted Ball Valve

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