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Type MR105

Figure 2. Type MR105 with Low-Pressure Actuator Operational Schematic

M1178

CONTROL SPRING

ACTUATOR

ACTUATOR STEM

CAGE

VALVE SPRING

VALVE PLUG

DIAPHRAGM





SPRING CASE VENT





LINE CONNECTION

SEAT RING

downstream as the regulator opens in response to the

decreased pressure underneath the diaphragm. The

downward motion of the plug allows ow through the

cage into the downstream system.

Increased downstream pressure permits the regulator

to close. The combination of valve spring force and

valve plug unbalance provides positive valve plug

shutoff against the port and upper seals.

Installation

WARNING

Personal injury or system damage

may result if this regulator is installed,

without appropriate overpressure

protection, where service conditions

could exceed the limits given in the



nameplate. Refer to Overpressure

Protection section for recommendations

on how to prevent service conditions

from exceeding those limits.

Additionally, physical damage to the

regulator may result in personal injury

or property damage due to escaping of

accumulated gas. To avoid such injury

and damage, install the regulator in a

safe location.

All vents should be kept open to permit



openings against entrance of rain, snow,

insects or any other foreign material that

may plug the vent or vent line. On outdoor

installations, point the spring case vent

downward to allow condensate to drain.

Under enclosed conditions or indoors,

escaping gas may accumulate and be

an explosion hazard. In these cases,

the vent should be piped away from the

regulator to the outdoors.

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

1 2 3 4 5 6 7 8 9 ... 23 24

Reducing Regulators 1
Type MR105 10

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