Bray Triple Offset User Manual

Page 17

O & M

ASME CLASS

600 & 900

A D i v i s i o n o f B r a y I n t e r n a t i o n a l , I n c .

The Ultimate Critical Service Triple Offset Valve

O p e r a t i o n a n d M a i n t e n a n c e M a n u a l

11.2 Body seat (replaceable) Replacement

ence numbers. (Pg 13).
1. If valve is actuated with fail close or fail open

pneumatic/hydraulic actuator, remove it from

the valve. A suitable gearbox must be installed to

perform maintenance on the valve.

2. When the gearbox is installed on the valve, open it

until the disc seal ring is disengaged from the seat.

Clean the surface of the valve, blow out all debris

and clean out all the hex sockets of the disc seal

ring retaining cap screws.

3. Using the appropriate size hex key, completely

remove the upper dowel fasteners (B6) from the

body seat (replaceable) ring retainer (B3).

4. Below these dowels there are body seat (replaceable)

retaining lower dowels (B5) that compress the body

seat (replaceable) (B1) against the valve body.

Unscrew them until the Seat retainer snap ring (B4)

above the retaining ring is free to move. Remove

the seat retainer snap ring (B4) from the body.

Carefully clean the body seat (replaceable) ring

retainer (B3) and upper dowel fasteners (B6

5. Extract the body seat (replaceable) ring retainer

(B3), remove the seat alignment button (B7) that

retains the seat within the body and then remove the

body seat (replaceable) (B1).

6. Slightly grease (refer to lubrication table) the gasket

groove in the replacement body seat (replaceable),

install the new body seat (replaceable) gasket (B2),

place this seat/gasket sub-assembly into the valve

body paying attention that the groove of seat is

aligned with the body groove and insert the seat

alignment button (B7).

7. Replace dowels if necessary.

8. Adjust the body seat (replaceable) ring retaining

bottom of the body seat (replaceable) ring retainer

(B3). Install the body seat (replaceable) ring

retainer (B3) and the seat retainer snap ring (B4)

on its groove in the body.

9. Using a cross bolting technique, tighten the seat

retaining lower dowels (B5) to 50% of torque

Table 5 (Pg. 17). Once all dowels

are tightened to the same torque, proceed to fully

tighten them to the 100% of the listed torque value.

10. Assemble the body seat (replaceable) ring

retaining upper dowels (B6) and using the cross

bolting technique, tighten them according to the

Table 5 (Pg. 17).

11. Rotate the disc (C1) to it’s previous position to

facilitate installation of the disc seal ring (C2).

Place a new disc seal gasket (C5) into the groove

on the disc face (C1). The mating side of the disc

seal ring gasket can be lightly greased to improve

retention in the groove. Be sure that the new disc

seal ring (C2) is assembled with the collar disc

seal ring (C3) and kept together with the disc seal

ring collar pin (C4). Place the disc seal ring and

collar onto the disc making sure the collar groove

is aligned with the disc seal ring collar alignment

button (C6). Place the disc seal ring retainer (C7)

over the disc seal ring. Apply anti-seize compound

to the disc seal ring retaining cap screws (C8). All

of the cap screws (C8) need to be fully threaded

this time. Lubricate the sealing surfaces of the disc

seal ring (C2) and the body seat (replaceable) (B1).

12. Cycle the valve with the actuator 2-3 times, only

closing the valve to the point where the disc seal

ring engages with the seat. Check each time that

the disc seal ring makes full contact with the body

seat (replaceable) without torquing into the seat.

Attention should be paid in the closing stroke that

the body seat (replaceable) does not scratch the disc

seal ring. This will allow the disc seal ring and seat

to be properly aligned. Tighten at least four screws

in the seal retainer to prevent the disc seal ring from

further movement. Open the valve approximately

disc seal ring,disc seal ring retainer) are aligned.

Tighten the disc seal ring retainer cap screws

(C8) using a cross bolting technique, to the 50%

Table 4 (Pg. 16). Once all

screws are tightened at the same torque, proceed

to fully tighten them to 100% of the listed torque

value.

13. Remove the gearbox (if installed), mount the valve

actuator and test the valve.

11.3 Disc Seal Ring Replacement

ence numbers. (Pg 13).

1. If valve is actuated with fail close or fail open