Emerson 95 Series Pressure Reducing Regulators Manual de Instruções descarregar pdf (Página 4)

Types 95LD and 95HD

Type 95HD Differential Pressure Reducing Regulator

M1006

INLET PRESSURE

OUTLET PRESSURE

October 2006

Type 95HD

LOADING PRESSURE

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

Type 95HD Differential Pressure Reducing Regulator

M1006

INLET PRESSURE

OUTLET PRESSURE

October 2006

Type 95HD

LOADING PRESSURE



Types 95LD and 95HD regulators maintain a differential

pressure between the loading supply pressure and the

downstream pressure of the regulator.

Refer to Figure 2. The design of the regulator isolates

the diaphragm and pressure response chamber from

the main ow stream. The downstream pressure

(outlet pressure) is registered under the diaphragm

through the pitot tube or registration hole. If the

downstream pressure increases, pressure under the

diaphragm also increases. This force overcomes

the spring compression and loading supply pressure,

allowing the stem to rise. The valve plug spring forces

the valve plug closer to the orice. Flow through the

regulator is reduced so that downstream pressure

returns to the desired differential level. When the

downstream pressure decreases, the opposite

action takes place. Pressure under the diaphragm

decreases. The valve stem pushes the valve plug

downward, opening the ow stream and increasing the

ow through the regulator. Downstream pressure rises

back to the desired differential level.



Before installing the regulator, be sure the chosen

location is adequately protected from damage by

vehicles and other external sources. The regulator

should be away from building eaves and above

probable snow levels. Temperature conditions should

not exceed the limits shown in Specications section.

Unpack the regulator and remove the protective

shipping plugs from the end connections of the

body and the pressure connection in the spring

case. Be sure the body and connecting pipelines

are clean. Coat the pipeline threads with a suitable

pipe compound. The regulator may be installed in

any position as long as the ow is in the direction

indicated by the arrow cast on the body.

The design of the regulator isolates the diaphragm

and the pressure response chamber from the main

ow steam. Outlet pressure registers under the

diaphragm through the pitot tube or registration

hole. Loading pressure registers on the top of the

diaphragm. The loading pressure is connected to the

NPT connection in the spring case.





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





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







The Types 95LD and 95HD have outlet pressure

ratings that are lower than the inlet pressure ratings.

Some type of overpressure protection is needed

if the actual inlet pressure can exceed the outlet

pressure rating. Common methods of overpressure

protection include relief valves, monitoring

regulators, or series regulation.

The maximum pressures that should not be exceeded

are stamped on the nameplate and are also shown in

the Specications section and Table 1.













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



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



W0078*

Figure 2. Type 95HD Operational Schematic

(Also Typical of 95LD)









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