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Top Entry Trunion Ball Valve

1. Product overview

Top entry trunnion ball valve, one piece body.

A top entry trunnion ball valve for low temperature service, ASTM A352 LCC body, 600LB.

 

Metals Valve supplies top entry trunnion ball valves in cast steel one piece body with trunnion mounted design, soft seated. The ball, seat rings and other trims shall be inserted into the valve cavity from the top first. Then, the bonnet, with the stem in place, is bolted to the valve body. Gaskets are employed to prevent leakage at the body-bonnet joint. A top entry trunnion ball valve can be conveniently maintained by removing the bonnet, without removing the valve from the pipeline. Compared to the split body side entry ball valves, it eliminates the possible leakage from body joints.

2. Design features and material selection for top entry trunnion ball valves

Top entry ball valves uses trunnion-mounted balls and spring-loaded seats, the ball has either integral or separate lower post that is seated in the bottom of the body. The seats are placed on both sides of the ball and the entire assembly is placed in the body. The top-works, consisting of a bonnet cap, packing box, gland flange, and separate stem, are installed above the ball. When the bonnet-cap bolting is tightened, the resulting compression energizes the seats. The joint between the bonnet cap and the body is sealed using gaskets.

Design standards: API 6D, ISO 17292 ASME B16.34; Fire safe to API 607, API 6FA, ISO 10497; End connection: ASME B16.5, ASME B16.25, ASME B16.11; Inspection and test: API 598, API 6D, EN 12266-1. The top entry trunnion ball valve is generally designed to full port(FB), 1 piece unibody, lever/gear or actuator operated. Size range: 1-1/2″ ~ 24″; Pressure ratings: 150LB~2500LB. Serial Number: TETMBV26. See the dimensional & weight specifications of TETMBV26.

Design Features

Design Features of top entry trounion mounted ball valve

Illustration of design features of top entry trunnion ball valve, RF ends.

(1) Double O-rings seals to prevent leakage from stem- bonnet joint.
(2) T-shaped blow-out proof stem design.
(3) Fire safe metal to metal design for emergency seals once soft seating materials are disintegrated after fire.
(4) The one piece integral body has improved mechanical properties.
(5) Gasket & O-ring combined arrangement to prevent leakage from body joints.
(6) The seat is spring-energized to ensure low-pressure tightness.
(7) Sealant injection fittings to prevent seat leakage in case the internal sealing fails.

Material Selection

3D explosive of top entry trunnion ball valve

The 3D explosive view of top entry trunnion ball valve, 1 piece body, RF flanged.

ItemPart NameCarbon SteelStainless SteelLow Temperature
1BodyASTM A216 WCBASTM A351 CF8MASTM A352 LCB
2BonnetASTM A105NASTM A182 F316ASTM A350 LF2
3BallASTM A105N+ENPASTM A182 F316ASTM A352 LF2+ENP
4Support RingStainless SteelStainless SteelStainless Steel
5Seat InsertRPTFE/NYLON/PEEKRPTFE/NYLON/PEEKRPTFE/NYLON/PEEK
6Seat RingASTM A105N+ENPASTM A182 F316ASTM A350 LF2+ENP
7Spring SupportASTM A105N+ENPASTM A182 F316ASTM A350 LF2+ENP
8StemASTM A105N+ENPASTM A182 F316ASTM A350 LF2+ENP
9GasketSS316+GraphiteSS316+GraphiteSS316+Graphite
10Fire Safe SealSS316+GraphiteSS316+GraphiteSS316+Graphite
11Injection FittingSS304SS304SS304
12Injection FittingSS304SS304SS304
13KeyCarbon SteelStainless SteelStainless Steel
14YokeCarbon SteelCarbon SteelCarbon Steel
15Thrust WasherPTFEPTFEPTFE
16Thrust WasherPTFEPTFEPTFE
17BearingSS316+PTFESS316+PTFESS316+PTFE
18BearingSS316+PTFESS316+PTFESS316+PTFE
19Vent ValveStainless SteelStainless SteelStainless Steel
20DrainStainless SteelStainless SteelStainless Steel
21Gland FlangeASTM A105NASTM A182 F316ASTM A350 LF2
22GlandStainless SteelStainless SteelStainless Steel
23PackingSS316+GraphiteSS316+GraphiteSS316+Graphite
24TrunnionASTM A105N+ENPASTM A182 F316ASTM A350 LF2+ENP
25SpringInconel X-750Inconel X-750Inconel X-750
26Anti-Static DeviceSS301SS301SS301
27O-RingHNBR/ VITONHNBR/ VITONHNBR/ VITON
28O-RingHNBR/ VITONHNBR/ VITONHNBR/ VITON
29O-RingHNBR/ VITONHNBR/ VITONHNBR/ VITON
30O-RingHNBR/ VITONHNBR/ VITONHNBR/ VITON
31StudASTM A193 B7ASTM A193 B8ASTM A320 L7M
32NutASTM A194 2HASTM A194 8ASTM A194 7M
33Body StudASTM A193 B7ASTM A193 B8ASTM A320 L7M
34Body NutASTM A194 2HASTM A194 8ASTM A194 7M
35ScrewASTM A193 B7ASTM A193 B8ASTM A320 L7M
The material selection for cast steel top entry trunnion ball valves, flanged ends, 1 piece body. Custom-materials are available upon request.

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CATEGORY AND TAGS:

Trunnion Mounted Ball Valve

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