Emerson easy-Drive Handbook

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Fisherr D4 Control Valve Assembly
The Fisher D4 control valve is a compact, rugged globe
valve designed primarily for high-pressure throttling
applications using either pneumatic or electric control.
This valve is ideal for use on pressure and flow control
applications within the oil and gas production industry.
The D4 is an excellent control valve for high-pressure
separators, scrubbers, and other processing
equipment. These valves are especially useful for
either throttling or on/off control of liquids or gases
which are gritty, sticky, or which have a tendency to
builduponinternalvalveparts.
If the control valve requires maintenance, the trim and
packing can be maintained by removing the deep-bore
hammer nut and lifting the actuator/bonnet assembly
off the valve without disassembling the actuator.
Features
Electric and Pneumatic
Safer Bonnet / Valve Body Connection– Unique
design provides additional protection if disassembly
of bonnet/valve body connection is inadvertently
started while there is still pressure in the valve body.
Pins mounted in the valve bonnet help ensure the
bonnet disengages from the valve body as the
hammer nut is removed, while the threads are still
engaged.
Heavy-Duty Guiding–Massive guiding (figures 1 and
2) positively aligns the valve plug in the seat ring for
reliable service. The screwed-in seat ring completely
encloses the seat ring gasket.
Live-loaded Packing System–The packing system
provides an improved stem seal to help prevent the
loss of valuable or hazardous process fluids or gases.
It features Fisher ENVIRO-SEALt packing
technology to provide reduced packing
maintenance.
FISHER D4 CONTROL VALVE WITH easy-Drive™ ELECTRIC
ACTUATOR (NPS 2 RF FLANGED END CONNECTION)
FISHER D4 CONTROL VALVE
(NPS 2 NPT END CONNECTION)
W9933-1
W8531
D4 Valve
D103039X012
Product Bulletin
51.2:D4
November 2013