Emerson EZH and EZHSO Series Pressure Reducing Regulators Manual de instrucciones descargar pdf (Pagina 4)

OS2 NACE

Packing gland

Description Valve

OSB VSE Standard

Assembly 181 089 181 090 181 104

Packing gland and stem 181 040 181 040

Packing gland 144 126

O-ring 400 514 400 505 400 514

O-ring 400 221

Fastening screw H M7 402 028 402 028

Fastening screw H M8 402 036 402 036

Flat washer (7) 405 005 405 005

Flat washer (8) 405 006 405 006

DESCRIPTION AND SPARE PARTS

(BM)

6c - Standard packing

gland

6d - VSE packing gland

ø24

ø 7

Packing gland assembly

Items in bold are spare parts

OPERATION (BM)

The detection stage consists of two parts:

• the releasing stem (1),

• the 1

stage trigger (2).

Through the intermediate of the safety manometric box (BMS), the

pressure provokes a pin movement (D1 or D2), which provokes the

rotation of the releasing stem (1) and frees the 1

stage trigger (2).

The power stage consists of two parts:

• the 2

stage trigger (3),

• the cam (4).

The 2

stage trigger (3), activated by the 1

stage trigger (2),

frees the cam (4), which provokes the valve to close.

After release, the resetting is ensured in two stages:

(detection stage, then power stage) see "commissioning".

Position indicator

The position of the detection stage can be seen through the

position indicator glass.

Memorization

The releasing stem will only start moving when pressure ap-

proaches the pressure set point. In all other cases, it remains

fixed. Furthermore the assembly has a very high resistance to

shocks. If pressure approaches the set point, the releasing stem

turns, but with the slightest shock or vibration it will go back to it’s

initial position and pressure returns to normal. The mechanism is

said to be non memorizing.

Resistance to shocks

This assembly has a remarkable resistance to shocks (20 vertical

shocks of 4 J and 20 pendular shocks of 9.81 J), with pressure close

to set point (for example: 186 mbar for a set point of 200 mbar).

CONNECTIONS (BM)

• Fixation BM / Connector:

H M7 or H M8 screws

16 N.m torque

• Sealed BM / Connector:

Flat O-ring (water resistant)

Packing gland (gas resistant)

• Mechanism contact / Slam shut valve:

Control rod

• BM connector / atmosphere:

Integrated vent nipple with screen (supplied) or compression

fitting (supplied) for 8/10 tube (not supplied)*

• Electrical connection:

See page 6

* The 8/10 tube should be angle-shaped on the top to avoid water from

entering.

7 - Mechanism

TRAVEL STOP

VALVE

N09

N07

N08

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