White Rodgers 25M01A-100 Brochure download pdf (Page 4)

25M GAS CONTROL

PRODUCT INFORMATION

R-4080

1) Calibration

The regulator is adjusted at the factory to give

the outlet pressure to an orifice as required by

the customer (This is referred to as the set

point). The outlet pressure (B) and the orifice

are selected by the customer to give the desired

flow rate of gas necesary for his application.

This adjustment is made at an inlet pressure (A)

of 7.0" W.C. for natural gas and 14.0" for L.P. gas.

2) Flucuating Inlet Pressure (A)

When the inlet pressure (A) increases, the outlet

pressure (B) starts to increase, but the increasing

force created on the diaphragm causes the stem to

move closer to the seat thereby throttling the flow

and reducing the pressure onto the diaphragm. As

this pressure decreases the stem moves away from

the seat allowing more flow and higher outlet

pressure (B). The outlet pressure, therefore, modu-

lates (high frequency and small amplitude) with

respect to the set point. This is normal operation

for direct acting types of regulators.

general specifications

Regulator Operation

The 25M series gas valve utilizes a direct acting regulator construction to maintain proper outlet gas

pressure for fluctuating inlet pressures. (Refer to Fig. 1)

Outline and Mounting Dimensions

Single Stage Model

Figure 1

1 2 3 4 5 6 7 8

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White Rodgers 25M01A-100 Brochure Page 4