Emerson EZH and EZHSO Series Pressure Reducing Regulators Manual de instrucciones descargar pdf (Pagina 5)

Type OS2

TRAVEL STOP

Table 7. Packing Gland Material

Body Bronze - - - -

Control rod Stainless steel Chromium plating

Truarc ring Nitrile (NBR) - - - -

CAUTION

Never use an extension pipe with the reset key

when resetting the 2nd stage (max. normal

torque 16 N•m, never go over 32 N•m).

WARNING

AUTHORIZED PERSONNEL ONLY

Risk of injury

After rearming, remove the reset key from

the stem. Do not put fingers in or near the

reset mechanism area.

VALVE

CLOSED POSITION

N10

Figure 15. Release Activation Stages

TRAVEL STOP

RESET DETECTION STAGE RESET POWER STAGE

VALVE VALVE

N11

N12

MAINTENANCE (BM)

• Tools:

- Spanner 11 (screw 7) and 13 (or 14) (screw 8)

- Screwdriver

• Control

- 1st and 2nd stage mechanism releasing

- Packing gland is tight shut

- Yoke greasing

• Disassembly

- Check that assembly is not under pressure

- Manual release of slam shut (Figure 14)

- Manually press on the releasing stem pin D1 or D2

(Figure 14, key 1) parallel to the BMS axe

- Unscrew the travel stop (screwdriver)

- Unscrew the BM fastening screws (flat spanner 11

(screw 7) and 13 (or 14) (screw 8)

- Disassemble the mechanism box (BM) from the

connector by unlocking the yoke

• Assembly

- Proceed in reverse order to disassembly

Note

The position of the travel stop (Figure 10,

key 7) depends on the type of assembly and

its size. Position A, B or C depending on

max. travel of slam shut valve: A = 15 mm

travel, B = 35 mm travel, C = 50 mm travel.

• Mechanism box (BM) intervention

To access the box the cover must be removed. When

unscrewing the nut a circlips is used to remove the O-ring.

The cover is held on by one screw which can be unscrewed

manually or using a socket screw key (recommended torque

foroptimalshutoff:6N•m).

• Resetting

To reset the slam shut (after the fault has been settled), the

1st mechanism stage must be reset by manually turning the

1st stage trigger. If the slam shut has an internal bypass the

cam must be slightly turned using a resetting key to bypass.

If the slam shut has an external bypass, a bypass valve will

be used. In both cases:

- Wait for the pressure to be equalized before resetting

the 2nd mechanism stage.

- When resetting the 2nd mechanism stage (opening of

the valve) a reset key is used (delete).

OPTIONS (BM)

• Remote alert (on BM1 or BM2)

Detects 2nd stage releasing (power)

• Remote control

Atmospheric solenoid valve (releasing by min. pressure)

for max. releasing pressure of 30 bar. Safety manometric

box (BMS) activated with a pneumatic or electro-

pneumatic impulse.

• Manual control on BM2 with 1 Type BMS 1 only

Push button (connected at the same place as a

Type BMS 2).

1 2 3 4 5 6 7 8 9 10 11 12

RELEASE RELAY 1
Type OS2 10

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