Emerson 66R Manual de Instruções descarregar pdf (Página 4)

Types 66R and 66RR

8. Each unit is factory-set for the set pressure specied on

the order. If no setting is specied, set pressure is factory

set at the mid-range of the Type 66R spring (key 6,

Figure 6) or the Type 66RR pilot control spring (key 6,

Figure 8). The set pressure of a unit is adjusted by

changing the compression of the appropriate spring.

Check and verify the spring setting to make sure that it is

correct for the application.

9. Set pressure for a Type 66RR relief valve is dened as

the pressure at which the main valve starts-to-

discharge. Type 66RR units have been designed so

that either a 1-inch w.c. (2,50 mbar) build-up or a

5 percent build-up (whichever is greater) above this set

pressure will open the main valve and permit it to yield

full open capacity.



Key numbers are referenced in Figure 6 for the Type 66R

relief valve, in Figure 7 for the Type 66RR main valve, and in

Figure 8 for the Type 66RR relief valve pilot.

With proper installation and adjustment completed, slowly

open the upstream shutoff valve while using gauges to

monitor pressure. To monitor inlet pressure, remove the pipe

plug (key 31, not shown) on the side of the body opposite

the ow arrow, and then temporarily install a gauge.

On backpressure or bypass applications using an isolating

bypass, also open the downstream shutoff valve and close

the bypass valve.

If set pressure adjustment is necessary, monitor inlet

pressure with a gauge during the adjustment procedure.

Adjust a Type 66R relief valve by removing the closing

cap (key 27) if necessary, loosening the locknut (key 45) if

used, and turning the adjusting screw (key 25) clockwise to

increase or counterclockwise to decrease the set pressure.

After adjustment, tighten the locknut or install the closing

cap. To adjust a Type 66RR relief, remove the Type Y695RR

pilot closing cap (key 22), turn the adjusting screw (key 35)

clockwise to increase or counterclockwise to decrease the

set pressure, and then install the closing cap.

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

Slowly close the upstream shutoff valve. Release all

pressure from the relief valve, and pilot if used, by opening

the upstream vent valve.

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Slowly close the upstream shutoff valve, while opening the

bypass valve if an isolating bypass is used. Then, close the

downstream shutoff valve, and open both vent valves to

release all pressure from the relief valve (and pilot if used).

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BJ8921-C

A2562

AV9712-D

A2564

AV9712-D

A2563-1

Figure 3. Type 66R Relief Valve Installation at Outlet

of Sewage Treatment Plant Digester Tank

Figure 4. Type 66RR Relief Valve Installation in

Vacuum Breaker System

Figure 5. Type 66R Relief Valve Installation in

Vacuum Regulation System

1 2 3 4 5 6 7 8 9 10 11 12

Types 66R and 66RR 1

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Emerson 66R Manual de Instruções Página 4

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