Emerson EZH and EZHSO Series Pressure Reducing Regulators Manuál s instrukcemi stáhnout pdf (Strana 10)

Type OS2

Table 19. Choice of BMS and Springs

Table 20. BMS Material

PSD Diaphragm Bellows Piston

0 to 20

20 to 72 (*)

72 to 100

AG 2.5

AG 5

Max. only

Min. only

Max. and Min.

(*) Choice between piston (regular) and bellows (optional). Bellows are recommended

if you require a small gap between releasing pressure, inlet pressure and exact

precision. Pistons do not facilitate minimum and maximum releasing.

Diaphragm Bellows Piston

Spring case Zinc-plated steel Stainless steel

Spring box Aluminum + Chromatation

Diaphragm Nitrile mesh

Piston Stainless steel

Bellows Stainless steel

Spring Zinc-plated steel

Adjustment screw Zinc-plated steel

Note

When the setpoint (max. or min.) falls

between the lowest and lowest point

possible, the precision may pass into a

superior range (example AG 2.5 —> AG 5). If

the point value is too close to that of the Pd,

the option RJGI tripping is recommended

(consult factory). In the case of two safety

manometric boxes (BMS) both boxes should

have a PSD > to the highest Pdo.

SELECTION OF BMS AND SPRINGS

Choose the type of safety manometric box (BMS) according

to: PMS, the type of releasing precision.

Choice of springs:

• Max. or Min. only

Take the spring with the highest point directly superior to

the releasing pressure required.

• Max. and Min.

Take the spring with the highest maximum point superior to

the maximum releasing pressure required or with the lowest

point inferior to the minimum tripping pressure required.

MATERIALS (BMS)

ADJUSTMENT (BMS)

Generally speaking, adjustments are carried out with the slam

shut valve closed. Only the detection stage is reset. Control of

the releasing value may be obtained by resetting the two stages.

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.

CAUTION

Before any adjustment, check that the

spring range installed corresponds to the

required setpoint.

Type BMS 1 (Figures 17 to 19)

Releasing by Max. Only

• Adjusting the releasing screw Free the min. hook (key 2).

Then in the following conditions:

- no pressure in the safety manometric box (BMS),

- setpoint spring compressed so that the distance

between the releasing screw and the pin D1 no longer

increases, adjust the releasing screw (key 1) to

X = 1.5 mm (detection stage set). Jam nut (key 3).

• Adjusting the max. only releasing pressure

Admit the releasing pressure to Pdo.

Screw the adjustment screw (key 5) until detection stage

can be set.

Unscrew the adjustment screw (key 5) until detection

stage release.

Check the pressure value at the releasing point

(adjust if necessary).

Jam nut (key 4).

Releasing by Min. Only

• Adjusting the releasing screw and hook

Free the min. hook (key 2).

Then in the following conditions:

- setpoint spring decompressed (adjustment screw

(key 5) unscrewed),

- pressure equal to the releasing pressure required for

Pd min in the BMS,

adjust the releasing screw (key 1) to X = 2 mm (detection

stage set).

Jam nut (key 3).

Put the hook (key 2) into position and adjust Y = 1.5 mm

with nuts (key 6) and (key 7).

Jam nuts (key 6) and (key 7).

• Adjusting the min. only releasing pressure

Continue admitting the required releasing pressure. Screw

the adjustment screw (key 5) until detection stage release.

Check the pressure value at the releasing point

(adjust if necessary). Jam lock nut (key 4).

N22

X = distance between releasing

screw and pin D1

Y = distance between releasing

screw and pin D2

3 5

2 4

1 2 ... 5 6 7 8 9 10 11 12

RELEASE RELAY 1
Type OS2 10

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