Emerson EZH and EZHSO Series Pressure Reducing Regulators Manual de Instruções descarregar pdf (Página 10)

OS2 NACE

Diaphragm Bellows Piston Piston NACE

Spring case Zinc pl steel Stainless steel

Spring box Aluminium + Chromatation

Diaphragm Nitrile mesh

Piston Stainless steel

Bellows

Stainless

steel

Spring Zinc pl steel Stainless steel

Adjustment

screw

Zinc pl steel

PMS box Maximum operational box pressure

Pa Nominal downstream regulator pressure

Pa max Maximum downstream regulator pressure (normally closing regulator pressure)

Pa min Minimum downstream regulator pressure (disturbance in function with flow and/or inlet pressure is to be considered)

Pd max Maximum releasing pressure

Max. high pt. High regulator pressure at maximum

Max. low pt. Low regulator pressure at maximum remaining within the accuracy class

Max. low pt. possible Low regulator pressure at furthest maximum point (precision is not guaranteed)

Pd min Minimum releasing pressure

Min. high pt. High minimum regulator pressure

Min. low pt. Low regulator pressure at minimum remaining within the accuracy class

Min. low pt. possible Low regulator pressure at furthest minimum point (precision is not guaranteed)

∆∆

∆1 Minimum difference allowed between Pd max. and Pa max. and/or between Pd min. and Pa min.

∆∆

∆2 Maximum difference allowed between maximum and minimum releasing pressure

PMS Diaphragm Bellows Piston

0 - 20

20 - 72 (*)

72 - 100

AG 2.5

AG 5

Max. only

Min. only

Max. & min.

DEFINITIONS

SELECTION GUIDE LINES: PRESSURE LIMITATIONS

Note: When the set point (max. or min.) falls between the lowest and lowest pt. possible, the precision may pass into a superior range (ex-

ample AG 2.5 —> AG 5). If the pt. value is too close to that of the Pa, the option RJGI tripping is recommended (consult factory). In

the case of 2 safety manometric boxes (BMS) both boxes should have a PMS > to the highest Pd max.

SELECTION OF BMS AND SPRINGS

Chose the type of safety manometric box (BMS) according to:

PMS, the type of releasing precision

(*) 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 allow for minimum and maximum releasing.

Choice of springs:

• Max. only 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)

Max. only Min. only Max. & Min.

Pd max. ≤ PMS box (BMS) Pa max. < PMS box (BMS) Pd max. ≤ PMS box (BMS)

Pd max. ≤ Max. high pt. Pd min. ≤ Min. high pt. Pd max. ≤ Max. high pt.

Pd max. ≥ Max. low pt. Pd min. ≥ Min. low pt. Pd max. ≥ Pa max. + ∆1

Pd max. ≥ Pa max. + ∆1 Pd min. ≥ Pa min. - ∆1 Pd min. ≥ Min. lowest pt. possible

Pd min. ≤ Pa min. - ∆1

Pd max. - Pd min. ≤ ∆2

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