Emerson EZH and EZHSO Series Pressure Reducing Regulators Arkusz Danych Pobierz pdf (Strona 12)

Bulletin 71.2:EZH and EZHSO

MECHANISM BOX

FIRST-STAGE

RESET PIN (WHITE)

SECOND-STAGE

RESET SHAFT

W8128

E0565

Figure 9. Slam-Shut Device in Open Position Figure 10. Slam-Shut Device in Closed Position

SETPOINT

ADJUSTMENT RING

TRAVEL STOP

See Figures 9 and 10 for the difference between the

device in open and closed positions. See Figure 11

for Type EZHOSX Installation Schematics. For more

information about the Types EZHOSX and EZHSO-OSX,

contact your local Sales Of ce.

Capacity Information

Note

EZH and EZHSO Series ﬂ ow capacities are

laboratory veri ed; therefore, they may

be sized for 100% ﬂ ow using published

capacities as shown. It is not necessary to

reduce published capacities.

Tables 17 through 20 show the natural gas regulating

capacities of the EZH and EZHSO Series regulators at

selected inlet pressures and outlet pressure settings.

Flows are in thousands of SCFH at 60°F and 14.7 psia

(or in thousands of Nm³/h at 0°C and 1.01325 bar) of

0.6 speci c gravity natural gas.

To determine equivalent capacities for air,

propane, butane or nitrogen, multiply the capacity

by the following appropriate conversion factor:

0.775 for air, 0.628 for propane, 0.548 for butane

or 0.789 for nitrogen. For gases of other speci c

gravities, multiply the given capacity by 0.775 and

divide by the square root of the appropriate speci c

gravity. Then, if capacity is desired in Nm³/h at 0°C and

1.01325 bar, multiply SCFH by 0.0268.

To  nd approximate regulating capacities at pressure

settings not given in Tables 17 through 20 or to  nd

wide-open  ow capacities for relief sizing at any inlet

pressure, perform one of the following procedures. Then

convert using the factors provided above, if necessary.

Critical Pressure Drops

For critical pressure drops (absolute outlet pressure

equal to or less than one-half of absolute inlet

pressure), use the following formula:

Q = (P

)(C

)(1.29)

Non-Critical Pressure Drops

For pressure drops lower than critical (absolute outlet

pressure greater than one-half of absolute inlet pressure).

Q =

520

SIN

3417

∆P

DEG

where,

Q = gas  ow rate, SCFH

= absolute inlet pressure, psia (P

gauge + 14.7)

= regulating or wide-open gas sizing coef cient

G = gas speci c gravity of the gas

T = absolute temperature of gas at inlet, °Rankine

=  ow coef cient

∆P = pressure drop across the regulator, psi

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 27 28

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Emerson EZH and EZHSO Series Pressure Reducing Regulators Arkusz Danych Strona 12

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