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Cast Steel Trunnion Mounted Ball Valve

1. Product overview

cast steel trunnion mounted ball valve

A typical cast steel trunnion mounted ball valve, worm gear operated, RF flanged ends, 2 piece split body, full port, 6″ 600LB.

 

 

Metals Valve provides cast steel trunnion mounted ball valves in a wide variety of cast materials covering carbon steel, alloy steel, and stainless steel. The ball of a trunnion mounted ball valve is fixed or constrained at two pivot points(upper stem and bottom stem). Buy using a bearing at the bottom stem(trunnion), only pivoting movement is allowed within the body cavity. The upstream seat is a floating seat and the process pressure pushes it against the ball’s sealing surface. The seat can also be pre-stressed during assembly, using seats that have a spring action. This design applies continuous pressure against a trunnion-mounted ball after the ball is installed, while the top-works apply a load to the entire closure member. Cast steel trunnion mounted ball valves are often soft seated and can attain a bubble tight sealing.

2. Design features and material selection

Design standards: API 6D, API 608, BS 5351, ISO 14313, ASME B16.34; Fire safe to API 607, BS 5146, ISO 10497; End connection: ASME B16.5, ASME B16.25, ASME B16.11; Face to face: ASME B16.10; Inspection and test: API 598, API 6D, EN 12266-1. The cast steel trunnion mounted ball valve is available in either full port(FB) or reduced port(RB), 2 piece split body, lever/gear or actuator operated.

Cast Steel Trunnion Mounted Ball Valve, 2 Piece Split Body, Side Entry - Table Chart
Class 150Class 300Class 400Class 600Class 900Class 1500Class 2500

Design Features

Design features of cast steel trunnion mounted ball valve

Illustration of design features of a conventional cast steel trunnion mounted ball valve, 2 piece split body with ISO mounting pad.

(1) The stem sealant injection fitting is furnished to prevent leakage from the stem in case of emergency.
(2) T-shaped blow-out proof stem design.
(3) The seat sealant injection fitting is furnished to prevent leakage from the seat.
(4) Bleeding/ venting plug to drain the body cavity to avoid over pressure.
(5) Double sealing O-rings to prevent leakage from stem area.
(6) Gasket & O-ring arrangement to prevent leakage from body joint.
(7) Seat spring to exert force on the seat to ensure a tight sealing even at low line pressure.
(8) Fire safe design: in case soft seating materials are deteriorated after fire, metal to metal sealing is available.

Material Selection

The 3D explosive view of a cast steel trunnion mounted ball valve

The 3D explosive view of a cast steel trunnion mounted ball valve, 2 piece split body.

ITEMPART NAMESTANDARD MATERIALSTAINLESS STEELLOW-TEMP SERVICE
1BodyASTM A216 WCBASTM A351 CF8MASTM A352 LCB
2BonnetASTM A216 WCBASTM A351 CF8MASTM A352 LCB
3BallASTM A105N+ENPASTM A182 F316ASTM A350 LF2+ENP
4Seatsee 5&6see 5&6see 5&6
5Seat InsertRPTFE/PEEK/NYLONRPTFE/PEEK/NYLONRPTFE/PEEK/NYLON
6Seat RingASTM A105N+ENPASTM A182 F316ASTM A350 LF2+ENP
7StemASTM A105N+ENPASTM A182 F316ASTM A350 LF2+ENP
8Alignment PinStainless SteelStainless SteelStainless Steel
9Thrust WasherPTFEPTFEPTFE
10SupportASTM A588 B+ENPASTM A351 CF8MASTM A588 B+ENP
11Gasket316SS+Graphite316SS+Graphite316SS+Graphite
12Gasket316SS+Graphite316SS+Graphite316SS+Graphite
13Seal Ring316SS+Graphite316SS+Graphite316SS+Graphite
14Seal Ring316SS+Graphite316SS+Graphite316SS+Graphite
15KeyCarbon SteelCarbon SteelCarbon Steel
16Cover FlangeASTM A105NASTM A182 F316ASTM A350 LF2
17Top FlangeASTM A105NASTM A182 F316ASTM A350 LF2
18Thrust WasherPTFEPTFEPTFE
19Bearing316SS+PTFE+MoS2316SS+PTFE+MoS2316SS+PTFE+MoS2
20Bearing316SS+PTFE316SS+PTFE316SS+PTFE
21Vent ValveStainless SteelStainless SteelStainless Steel
22Drain PlugStainless SteelStainless SteelStainless Steel
23SpringInconel X-750Inconel X-750Inconel X-750
24O-RingNBRNBRNBR
25O-RingHNBR/VITONHNBR/VITONHNBR/VITON
26O-RingHNBR/VITONHNBR/VITONHNBR/VITON
27O-RingHNBR/VITONHNBR/VITONHNBR/VITON
28O-RingHNBR/VITONHNBR/VITONHNBR/VITON
29O-RingHNBR/VITONHNBR/VITONHNBR/VITON
30Body StudASTM A193 B7ASTM A193 B8ASTM A320 L7M
31Body NutASTM A194 2HASTM A194 8ASTM A194 7M
32ScrewASTM A193 B7ASTM A193 B8ASTM A320 L7M
33ScrewASTM A193 B7ASTM A193 B8ASTM A320 L7M
34Anti-StaticSS304/SS316SS304/SS316SS304/SS316
35InjectionSS304/SS316SS304/SS316SS304/SS316
36InjectionSS304/SS316SS304/SS316SS304/SS316
The material selection of cast steel trunnion mounted ball valves, 2 piece split body design. Other materials are available upon request.

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Trunnion Mounted Ball Valve

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