Side Entry Trunnion Ball Valve

A side-entry trunnon ball valve is a type of trunnon-mounted ball valve where the ball is assembled from the side.

The body is made of cast or forged steel with construction comes in 2 or 3-pieces depending on the size and class.

The combination of trunnion-mounted balls and unique spring-loaded upstream sealing provides bubble-tight shut-off and low operating torques, even at extremely high shut-off pressure.

Side-entry trunnion ball valves are the standard ball valve type and should be the default choice for general service.

General Features and Benefits

  • Standard double block sealing performance: each seat blocks the flow from each side.
  • Cavity over-pressure self-relieving: Over-pressure in the body cavity will pop the seats off the ball surface, and excess pressure will be relieved into the pipeline. After the pop-off action, the seats will return to their normal position, in contact with the ball.
  • Body and bonnet sealing: gasket and O-ring seal to guarantee the sealing performance at high and low pressure conditions.
  • Leakage rate: ISO 5208/EN 12266-1 Rate A (zero visual leakage)
  • Fire-safe design to API 607/API 6FA
  • Anti-static design: A static conduction spring is used as standard between the stem and the ball.
  • Anti-blow-out stem
  • Low-operation torque design

Options

  • Fully welded ball valve
  • Double piston effect seat (DIB-1, DIB-2) 
     

Design Features

Forged Steel Trunnion Mounted Ball Valves

side entry trunnion ball valve design feature

① Two O-ring seals prevent leakage from the stem area.
② Blow-out-proof stem: a safety feature that functions to assure stem sealing at all pressures.
③ Back-up metal-to-metal Sealing: When primary soft-seat material is deteriorated by fire, the metal-to-metal seat provides shutoff.
④ O-ring and Gasket Combination: Prevents leakage from the body connection area.
⑤ Floating spring-loaded seats: ensure sealing even at low pressures.


Cast Steel Trunnion Mounted Ball Valves

cast steel trunnion ball valve design feature

① Emergency Sealant Injection Fitting: Prevents leakage from the stem.
② Blow-out Proof Stem: Stem functions as the backseat to assure stem sealing at all pressures.
③ Emergency Sealant Injection Fitting: Prevents leakage from the seat.
④ Drain plug:Relieves the body cavity.
⑤ Double Sealing O-rings:Prevents leakage from stem area.
⑥ O-ring & Gasket Combination:Prevents leakage from body connection area.
⑦ Floating Spring: Loaded seats assure sealing, even at low pressures.
⑧ Metal-to-Metal Sealing: When soft seals are deteriorated by fire, seat float to shut of the line fluid.


Explosive Drawing

Forged Steel Trunnion Mounted Ball Valve

side entry forged steel trunnion ball valve drawing


Material Specifications

No Part Standard Stainless Steel Sour Service Low Temperature
Service
1 Body ASTM A105N ASTM A182 F316 ASTM A105N ASTM A350 LF2
2 Body cap ASTM A105N ASTM A182 F316 ASTM A105N ASTM A350 LF2
3 Ball ASTM A105N/ENP ASTM A182 F316 ASTM A105N/ENP ASTM A350 LF2/ENP
4 Seat Assembly(5+6) 5&6 5&6 5&6 5&6
5 Seat Insert RPTFE/NYLON/PEEK RPTFE/NYLON/PEEK RPTFE/NYLON/PEEK RPTFE/NYLON/PEEK
6 Seat Ring ASTM A105N/ENP ASTM A182 F316 ASTM A105N/ENP ASTM A350 LF2/ENP
7 Stem ASTM A105N/ENP ASTM A182 F316 ASTM A105N/ENP ASTM A350 LF2/ENP
8 Trunnion ASTM A182 F6a ASTM A182 F316L ASTM A182 F6a ASTM A182 F6a
9 Gasket 316SS+Graphite 316SS+Graphite 316SS+Graphite 316SS+Graphite
10 Gasket 316SS+Graphite 316SS+Graphite 316SS+Graphite 316SS+Graphite
11 Gasket 316SS+Graphite 316SS+Graphite 316SS+Graphite 316SS+Graphite
12 Gasket 316SS+Graphite 316SS+Graphite 316SS+Graphite 316SS+Graphite
13 Fire Safe seal 316SS+Graphite 316SS+Graphite 316SS+Graphite 316SS+Graphite
14 Top Flange ASTM A105N ASTM A182 F304 ASTM A105N ASTM A350 LF2
15 Cover Flange ASTM A105N ASTM A182 F316 ASTM A105N ASTM A350 LF2
16 Thrust Washer PTFE PTFE PTFE PTFE
17 Bearing 316SS+PTFE+MoS2 316SS+PTFE+MoS2 316SS+PTFE+MoS2 316SS+PTFE+MoS2
18 Bearing 316SS+PTFE 316SS+PTFE 316SS+PTFE 316SS+PTFE
19 Cover ASTM A105N ASTM A182 F316 ASTM A105N ASTM A350 LF2
20 Pin Carbon Steel Stainless Steel Carbon Steel Carbon Steel
21 Pin Carbon Steel Stainless Steel Carbon Steel Carbon Steel
22 Anti-Static Device Stainless Steel Stainless Steel Stainless Steel Stainless Steel
23 Spring Inconel X-750 Inconel X-750 Inconel X-750 Inconel X-750
24 O-Ring HNBR/VITON HNBR/VITON HNBR/VITON HNBR/VITON
25 O-Ring NBR NBR NBR NBR
26 O-Ring HNBR/VITON HNBR/VITON HNBR/VITON HNBR/VITON
27 O-Ring HNBR/VITON HNBR/VITON HNBR/VITON HNBR/VITON
28 O-Ring HNBR/VITON HNBR/VITON HNBR/VITON HNBR/VITON
29 O-Ring HNBR/VITON HNBR/VITON HNBR/VITON HNBR/VITON
30 Vent Valve Stainless Steel Stainless Steel Stainless Steel Stainless Steel
31 Body Stud ASTM A193-B7 ASTM A193-B8 ASTM A193-B7M ASTM A320-L7M
32 Body Nut ASTM A194-2H ASTM A194-8 ASTM A194-2HM ASTM A194-7M
33 Screw ASTM A193-B7 ASTM A193-B8 ASTM A193-B7M ASTM A320-L7M
34 Body Stud ASTM A193-B7 ASTM A193-B8 ASTM A193-B7M ASTM A320-L7M
35 Body Nut ASTM A194-2H ASTM A194-8 ASTM A194-2HM ASTM A194-7M
36 Screw ASTM A193-B7 ASTM A193-B8 ASTM A193-B7M ASTM A320-L7M


Cast Steel Trunnion Mounted Ball Valve 

cast steel trunnion ball valve explosive drawing

Material Specifications

No Part Carbon Steel Stainless Steel Sour Service Low Temperature
Service
1 Body ASTM A216-WCB ASTM A351-CF8M ASTM A216-WCB ASTM A352-LCB
2 Body cap ASTM A216-WCB ASTM A351-CF8M ASTM A216-WCB ASTM A352-LCB
3 Ball ASTM A105N/ENP ASTM A182 F316 ASTM A105N/ENP ASTM A350-LF2/ENP
4 Seat Assembly(5+6) 5&6 5&6 5&6 5&6
5 Seat Insert RPTFE/NYLON/PEEK RPTFE/NYLON/PEEK RPTFE/NYLON/PEEK RPTFE/NYLON/PEEK
6 Seat Ring ASTM A105N/ENP ASTM A182 F316 ASTM A105N/ENP ASTM A350-LF2/ENP
7 Stem ASTM A105N/ENP ASTM A182 F316 ASTM A105N/ENP ASTM A350-LF2/ENP
8 Trunnion Alignment Pin Stainless Steel Stainless Steel Stainless Steel Stainless Steel
9 Thrust Washer PTFE PTFE PTFE PTFE
10 Trunnion Support ASTM A588B/ENP ASTM A351-CF3M ASTM A588B/ENP ASTM A588B/ENP
11 Gasket 316SS+Graphite 316SS+Graphite 316SS+Graphite 316SS+Graphite
12 Gasket 316SS+Graphite 316SS+Graphite 316SS+Graphite 316SS+Graphite
13 Fire Safe seal 316SS+Graphite 316SS+Graphite 316SS+Graphite 316SS+Graphite
14 Fire Safe seal 316SS+Graphite 316SS+Graphite 316SS+Graphite 316SS+Graphite
15 Key Carbon Steel Stainless Steel Carbon Steel Stainless Steel
16 Cover Flange ASTM A105N ASTM A182 F316 ASTM A105N ASTM A350-LF2
17 Top Flange ASTM A105N ASTM A182 F316 ASTM A105N ASTM A350-LF2
18 Thrust Washer PTFE PTFE PTFE PTFE
19 Bearing 316SS+PTFE+MoS2 316SS+PTFE+MoS2 316SS+PTFE+MoS2 316SS+PTFE+MoS2
20 Bearing 316SS+PTFE 316SS+PTFE 316SS+PTFE 316SS+PTFE
21 Vent Valve Stainless Steel Stainless Steel Stainless Steel Stainless Steel
22 Drain Stainless Steel Stainless Steel Stainless Steel Stainless Steel
23 Spring Inconel X-750 Inconel X-750 Inconel X-750 Inconel X-750
24 O-Ring NBR NBR NBR NBR
25 O-Ring HNBR/VITON HNBR/VITON HNBR/VITON HNBR/VITON
26 O-Ring HNBR/VITON HNBR/VITON HNBR/VITON HNBR/VITON
27 O-Ring HNBR/VITON HNBR/VITON HNBR/VITON HNBR/VITON
28 O-Ring HNBR/VITON HNBR/VITON HNBR/VITON HNBR/VITON
29 O-Ring HNBR/VITON HNBR/VITON HNBR/VITON HNBR/VITON
30 Body Stud ASTM A193-B7 ASTM A193-B8 ASTM A193-B7M ASTM A320-L7M
31 Body Nut ASTM A194-2H ASTM A194-8 ASTM A194-2HM ASTM A194-7M
32 Screw ASTM A193-B7 Stainless Steel ASTM A193-B7M ASTM A320-L7M
33 Screw ASTM A193-B7 Stainless Steel ASTM A193-B7M ASTM A320-L7M
34 Anti-Static Device Stainless Steel Stainless Steel Stainless Steel Stainless Steel
35 Injection Stainless Steel Stainless Steel Stainless Steel Stainless Steel
36 Injection Stainless Steel Stainless Steel Stainless Steel Stainless Steel

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