Ball of trunnion ball valve is fixed, it does not
move with medium pressure. Trunnion ball valve has floating
seats. The seats move with the medium pressure to tight the
ball and seal ring to ensure sealing reliability. Bearings could be
mounted in top shaft and bottom shaft, which reduces operation torque.
This is widely used in valves with high pressure and big sizes. To
decrease the operation torque and increase sealing reliability,
lubricated ball valves are adopted in recent years. A special sealant
is injected between sealing faces of lubricated ball valve to create a
layer. This increase the sealing reliability while decreasing the
operation torque, which is better for high pressure, big sized ball
valves.
Sealant Injection Device
Trunnion mounted ball valves are provided with devices for Sealant
injection, which are on both the stem and seat for the trunnion ball
valves of DN>150mm (NPS6), and in the body cavity for the valve
of DN<125mm. When the O ring of stem or the body seat ring is
damaged due to accident, the medium leakage between body and stem can
be prevented by injecting the Sealant through the device.
Double Block and Bleed
Trunnion ball valve features the front ball
sealing design structure. Each seat of the ball valve can separately
cut off the medium at both upstream and downstream to achieve double
block function. When the ball valve is closed, body cavity is
segregated from both upstream and downstream even there is pressure at
both ends. The medium left in the body cavity could increase the
pressure to propel the seats. The medium could be bled out through the
relief valve to ensure valve safety.

Anti-static Design
Except for the anti-static features floating
ball valve has, the trunnion ball valve has more. The ball of the
trunnion ball valve gets close contact with each other through the
trunnion, adjusting cushion, and down-end cap, the passage of static
electricity thus forms together with the valve, which may lead the
static electricity caused by sparks generated by friction between the
ball and seat during on and off performance to the ground to prevent
the possible risk of fire or explosion.

Fire Safe Design
With the valve heated in a fire application,
the nonmetal material parts such as seat sealing ring of PTFE,O ring
for the stem, and sealing gasket for body and bonnet, might be damaged
due to high temperature. CRV's special design of auxiliary metal to
metal or the graphite seal is designed for the trunnion ball valve to
effectively prevent both internal and external leakage of the valve in
case of fire As required by customers, CRV's fire safe design for the
trunnion ball valve meets the requirement of API 607, API 6Fa and BS
6755.

Design Feature:
Trunnion Mounted. Side Entry/Top Entry. Independent Ball & Stem
Full Bore/Reduced Bore. Cast 2pcs Bolted Body /Forged 3pcs Bolted or
Welded Body
Soft Insert Seat/Metal–to-Metal Seat
Anti-Blowout Stem. Fire Safe Design to API 6FA/607. Anti-static Device
Double Block & Bleed Function. With Vent and Drain Hole
Grease Injection on Stem & Seat . Extended Bonnet or Stem
Optional
Specification:
Design: API 6D API 608 BS5351 ASME B16.34
Size: 2-40. Pressure Rating: 150Lb-2500Lb
Face to Face: API 6D ,ANSI B16.10
End Connection: RF RTJ/ANSI B16.5&ANSI B16.47, BW
(ANSI B16.25)
Body Material: WCB, A105 CF8, CF8M, CF3, CF3M, F304, F316, F304L F316L
LCB LF2 F51.
Ball Coating: ENP,Tungsten Carbide Coat (TCC), Chrome Carbide
Coat (CCC)
Test: API 6D API 598. Marking: MS SP-25
Actuation: Lever, Worm Gear, Electrical, Pheumatic,Hydraulic
Standard Material Specification
|
Carbon Steel |
Stainless Steel |
|
WCB |
LCB |
CF8 |
CF8M |
CF3 |
CF3M |
Body |
A105 |
A350 LF2 |
A182 F304 |
A182 F316 |
A182 F304L |
A182 F316L |
Ball |
A105/ENP/Cr |
A182 F304 |
A351 CF8 |
A351 CF8M |
A351 CF3 |
A351 CF3M |
Stem |
A182 F6 |
A182 F6 |
A182 F304 |
A182 F316 |
A182 F304L |
A182 F316L |
Seat |
A182 F6 |
A182 F6 |
A182 F304 |
A182 F316 |
A182 F304L |
A182 F316L |
Seat Ring |
PTFE,NYLON
PEEK. or HF(Co-CrA) |
Gasket |
PTFE
or Flexible Graphite and stainless Steel |
O-Ring |
VITON |
VITON |
VITON |
VITON |
VITON |
VITON |
Trunnion |
A182 F6 |
A182 F6 |
A182 F304 |
A182 F316 |
A182 F304L |
A182 F316L |
Spring |
AISI
6160 17-17PH(inconel for NACE)Ni-Cr Alloy |
Stem spring |
17-7PH(inconel
for NACE)Ni-Cr Alloy |
Bonnet Bolt |
A193
B7 A320 L7 A320 B8 A193 B8M |
Bonnet Nut |
A194
2H A194 4 A194 8 |
Gland |
A182 F6 |
A182 F6 |
A182 F304 |
A182 F316 |
A182 F304L |
A182 F316L |
Stem packing |
PTFE
or Flexible Graphite |
Bonnet |
A216 WCB A105 |
A352 F6 A350 LF2 |
A351 CF8 |
A351 CF8M |
A351 CF3 |
A351 CF3M |
|