Emerson Fisher Baumann 81000 Manual de instrucciones descargar pdf (Pagina 4)

Instruction Manual

D103366X012

81000 Valve

May 2012

4. A pressure gauge may be installed in the 1/8 inch port in t he bolted bonnet (see figure 4).Thisgaugetellswhen

leakage or breakage of the diaphragm has occurred.

WARNING

To avoid personal injury or property damage, do not a ttempt to do any work on a valve while the system is in operation,

the valve must be isolated 100% from the active system and the isolated line voided of pressure and/or hazardous fluids.

Air Piping

1. For an air-to-extend actuator (air-to-close action), connect the actuating air pressure line to the 1/4 NPT opening in

the upper diaphragm case. For an air-to-retract actuator (air-to-open action) connect the actuating air pressure line

to the 1/4 NPT in the lower diaphragm case. See figures 2 and 3.

2. Use 6.4 mm (1/4 inch) O.D. tubing or equivalent for all air lines. If the air line exceeds 8 m (25 ft) in length, 9.5 mm

(3/8 inch) tubing is preferred. Air pressure should not to exceed 2.5 bar (35 psig).

Flow Direction

Therearetwopossiblewaystopassfluidthroughthevalve(seefigures6and7).Intheflow-to-openmode,fluid

enters from Port A to Port B. In the flow-to-close mode, fluid enters from Port B to Port A.

Each flow direction has its advantages and disadvantages. The following guide will make a selection easier.

UseFlowFromPortBtoA

D In vacuum applications with spring P/N 81168Z, vacuum on down stream.

D With fluids that have a tendency to cavitate.

D In applications where inlet pressure is low and no seat spring can be tolerated.

D When self-cleaning operation is required for removal of solid particles in flow stream.

UseFlowFromPortAtoB

D Whenvalvehastofailcloseincaseofburstingordamagetothesealingdiaphragm.

Disassembly

WARNING

If there is evidence of process fluid under pressure leaking from the joint, retighten the valve body/joint nuts and return to

the Warning at the beginning of the Maintenance section to provide proper steps have been taken to isolate the valve and

relieve process pressure.

1. Remove the actuator by unscrewing the yoke drive nut (key 9) and lifting off the complete actuator assembly. This

keeps the actuator assembly intact and calibrated to the factory setting. Refer to actuator instructions.

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Emerson Fisher Baumann 81000 Manual de instrucciones Pagina 4