Flowserve Trunnball Bedienungsanleitung PDF herunterladen (Seite 5)

3. Shut off all compressed air connections and

isolate all electrical connections to the actuator.

4. Disconnect all compressed air lines and electric

cables connected to the actuator.

5. Loosen the ﬂ ange joint between the valve and

the pipework. Then lift out the valve. Don’t use

the actuator for lifting.

Apply all lifting forces to

the valve itself and not to the actuator

- Fig. 1.

N.B

In certain applications, the pipe can be discon-

nected from one side of the valve, and the body

half (2) - Fig. 3 - can be removed, without the

need for removing the whole valve from the

pipework.

Mark the relative positions of the body halves

by centre-punching before the dismounting

since the pattern of the holes drilled in the valve

ﬂ ange and pipe ﬂ ange may vary.

Fig. 4. Lifting the ball with the valve in closed posi-

tion - here with the valve on a work bench.

It can also be done with mounted actuator

and the body (1) mounted in the pipework.

8. Maintenance

Many valves are installed in such locations that their

performance is of decisive importance to the entire

process. Such valves should be inspected regularly

and any faults should immediately be corrected.

.1 To remove the valve from the pipework

No special tools are needed for the inspection and

maintenance.

1. Ensure that the recommended spare parts and

gaskets for the pipe ﬂ anges are available.

2. Close the valve.

Before dismounting the valve,

make certain that

it is completely empty

. Operate the valve several

times between the open and closed positions to

ensure that the space between the valve body and

ball is not under pressure.

Caution! The liquid in the valve may be harmful.

.2 To inspect and replace the ball and seatrings

The actuator does not need to be removed

for

replacing the seatring and ball.

2. Operate the valve to make

certain that it is

completely empty

. Close the valve.

3. Remove the bodyhalf (2).

4. Remove the ball and the trunnion plates - easy to

do when the valve is in closed position.

5. Remove the trunnion plates and the metaloplast

bearing from the bearing journal of the ball.

6. Carefully inspect the ball and the seatrings.

7. Clean all parts carefully. First use hot water and then,

if necessary, some degreasing compound. Do not

scrape any machined surfaces with hard tools.

.3 Valves with seatrings in PTFE

1. To ensure good tightness of the valve, change the

seatrings, wave springs and sealings if they are worn

or damaged.

2. Mount the wave spring and sealing ring (pos 24 and

25) behind the seatring (pos 20).

3. Inspect the ball. Minor damage to the sealing surface

can be removed by polishing with ﬁ ne emery cloth. If

the ball has major damages, it must be replaced to

ensure satisfactory tightness.

4. Change sealing ring (14) between the two body-

halves.

5. Change the metaloplast bearing in the trunnion plates.

6. Mount the bearing plates on the bearing journal of the

ball.

7. Coat the ball with Molycote U. If the valve is intended

for service in an oxygen system, the ball can be coa-

ted with silicone grease, which is approved for oxygen

applications.

8. Lubricate all stainless steel bolts with suitable grease,

i.e. Crane Packings’s Thread-Grade or Gleitmo 600.

9. Mount the ball and the bearing cage in the bodyhalf

(1) and then the upper bodyhalf (2). Make sure that

the centrepunch marks made according to section 8.1

item 6 are lined up. Tighten the bolted joint of the two

bodyhalves alternately in several stages and tighten

them ﬁ nally as per the table below.

10. Torque for tightning of the bolted joint:

11. Operate the valve between closed and open positions.

12. If possible, pressure test the valve with water to check

its tightness - Fig. 5.

Make sure that the cavities of the

valve are properly ﬁ lled

with water before the pressure

testing. The valve should be pressure tested as follows:

Open valve: PN x 1,5

Closed valve: Max dp x 1,1

Bolt

Torque

Bolt

Torque Nm

M12

UNC 1/2”

M16

187

UNC 5/8”

175

M20

364

UNC 3/4”

308

M24

629

UNC 7/8”

493

UNC 1”

737

1 2 3 4 5 6 7 8

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