Marwin Valve FW4700 Series Boiler Feedwater Valve - Manual (Page 2)

Installation
Caution: Before installation of the valve:
1. Pipe must be free of tension both during and
after installation.
2. Pipe must be flushed to clean dirt, welding
residues, etc. which would damage ball or
seats.
3. The valve should be kept in OPEN POSITION
during installation and protective plastic
covers must be removed only at the moment of
installation.
4. Before shipment, the ball is lubricated with a
pure Vaseline oil. This can be easily removed
with an application compatible solvent if
required.
5. There may be some residual trapped water from
the valve pressure test between the ball and the
body cavity. This can be removed by partially
opening the valve, thereby exposing the cavity
to the through port of the ball.
 Valve -
The valve may be installed using standard pipe fitting
practice. It is recommended that unions be installed
before each end of threaded and welded valves for
easy installation and removal. The valve may be in-
stalled with the stem in the horizontal or vertical posi-
tion. The actuator should not be below the valve.
It is recommended that valve be installed with charac-
terized port upstream when valve is in open position.
This direction is indicated by flow arrow in Fig. 5.
 Unit -
1. Wiring. Wire the Honeywell Mod IV actuator in ac-
cordance with the appropriate wiring diagram in
Figures 1 to 3. Note that actuator operation must be
CW to close, CCW to open valve. For on-off (Fig. 1)
or resistance control (Fig. 2), the actuator must be
wired for proper rotation. Reverse motor rotation by
switching wires at motor or panel. For current and
voltage control (Fig. 3), the CCW / CW switch on
the Q7230A interface module must be set to CCW,
as shown in Fig. 3. Auxiliary limit switch wiring is
shown in Fig. 4. See Honeywell documentation,
included with shipment, for additional information.
2. Linkage (Stroke) Adjustment. To adjust the valve
stroke, loosen linkage connector and slide top link-
age joint towards the right on the motor bracket.
Lengthen rod to suit new position. Maximum de-
crease in valve travel is approximately 65% open.
3. Auxiliary Switch Adjustment. Auxiliary Switches can
be set to actuate at any point in the travel of the
motor. The SPDT switches are actuated by adjust-
able cams. Set cams by moving top of screwdriver
only. Pressing screwdriver against sides of cam
slots or use of excessive force could cause damage.
Each click is approximately two degrees of rotation.
the blue cam controls the valve open switch and the
red cam controls the valve closed switch. Rotating
the blue cam to the right decreases the open switch
and rotating it to the left increases the open switch.
Rotating the red cam to the right increases the
closed switch and rotating it to the left decreases the
closed switch. Be sure not to rotate the cams pass
the 90° rotation limit of the motor.
Operation
When commissioning an automated valve that has been
in long term storage, it is good practice to first manually
operate the valve several times with a wrench to break
the torque that may have built up during long term
storage.
Valve rotates clockwise (CW) to close, counterclockwise
(CCW) to open.
Maintenance
Before starting maintenance, please read information
contained in the Caution Section of the manual.
See applicable valve I & M manual, such as CV4700
manual.
Disassembly, Inspection and
Replacement, Reassembly, Testing and
Troubleshooting
Valve -
See applicable valve I & M manual, such as CV4700
manual.
Unit -
Refer to Fig. 5.
1. Valve and motor should be in fully closed position
when installing or adjusting linkage arm. Fully closed
position is as shown in Fig. 5.
2. Motor rotation is 90°. Valve rotates clockwise (CW)
to close, counterclockwise (CCW) to open. Refer to
"Installation", "Unit", "Wiring" and Fig. 5.
3. The linkage arms (3) are adjustable. For the boiler
feedwater valve, the linkage arms must be set paral-
lel to the sides of the mounting square. To do this,
remove bolt, align hole in head with center of the five
holes in arm, and reinsert and securely tighten bolt.
4. The push on clip (3A) that is part of the linkage arm
kit is used with the motor linkage arm to maintain the
thickness so that the linkage arm is pulled tight on
the motor shaft when bolt (1 0A) is tightened.
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