Watson McDaniel 455 SERIES Installation & Operating Instructions

428 Jones Boulevard
Limerick Airport Business Center
Pottstown, PA 19464
SERIES 455-SCREWED
I
NSTALLATION AND
Before installing the pressure regulating valve, be sure to blow out the
pipe line to remove all dirt, pipe scale, pipe chips, etc.
Watson McDaniel recommends a 'Y' type strainer be placed in the line on
the inlet side of the pressure regulating valve. A bypass line and hand
shut off valves and gauges should be in stalled on either side of the
regulating valve as shown in sketch.
Install the Series 455 pressure regulating valve in a straight horizontal run
of pipe away from any meters, tees, elbows, etc. which would cause flow
turbulence and effect regulation. The flow should be in the direction of
the arrow on the body with the diaphragm chamber above the center line
of the pipe. However, if head room is scarce, the second best position is
to install the valve in an inverted orientation with the diaphragm chamber
below the center line of the pipe..
WARNING: The Series 455 valve should not be installed in a vertical run
of pipe as the weight of the parts will cause increased wear and
subsequently shorten the life of the valve.
Connect a control line from the top of the diaphragm chamber to the top
of the piping on the downstream side of the valve. The control line should
be installed approximately 10 pipe diameters downstream of the valve in a
straight run of pipe away from any flow turbulence. A needle valve should
be installed in this control line for the purpose of dampening the response
of the valve if required.
On start-up check to see that the by-pass valve is closed and the
downstream pressure gauge is reading zero. The upstream pressure
Each Watson McDaniel Company Product is warranted against defects in material and workmanship for one year from date of shipment. This warranty
extends to the first retail purchaser only. All defective material must be returned to the person from whom you purchased the Product, transportation prepaid,
free of any liens or encumbrances, and if found to be defective will be repaired free of charge or replaced, at the warrantor's or seller's option. If the material
is replaced, any replacement will be invoiced in the usual manner and after inspection of alleged defective material an adjustment will be made for
depreciation caused by purchaser's use. In no event will Watson McDaniel Company be liable to do more than refund the original contract price. Incidental
and consequential damages are excluded, whether under this warranty or otherwise. All implied warranties, including warranties of merchantability and
fitness for a particular purpose, are disclaimed and excluded.
Phone: (610)495-5131
Fax: (610)495-5134
www.watsonmcdaniel.com
TOP DIAPHRAGM CASE
DIAPHRAGM ASSY
DIAPHRAGM*
DIAPHRAGM WASHER
DIAPHRAGM CASE NUTS
& BOLTS
BOTTOM DIAPHRAGM CASE
REGULATING SPRING
DIAPHRAGM STEM
STEM
VALVE BRACKET
PACKING ASSY
PACKING*
PACKING NUT
SPRING
BRACKET LOCKNUT
VALVE BONNET
MAIN VALVE ASSY
MAIN VALVE
MAIN VALVE SEAT
PILOT VALVE & STEM
PILOT VALVE STEM NUT
VALVE BODY
BOTTOM PLUG
*Recommended Spare Parts
O
PERATION



INSTRUCTION PART NO. 2227900
SERIES 455-FLANGED
TOP
PLATE
TOP
PLATE
GASKET*
FLOW
gauge should indicate the line pressure, and the hand valves on
the inlet and outlet side of the pressure regulating valve should
be full open before adjusting downstream pressure.
The Series 455 pressure regulating valves are diaphragm
actuated, spring loaded and are normally open. Increasing the
spring compression results in a higher downstream pressure,
while decreasing the spring compression reduces the down
stream pressure. On start up, slowly increase downstream
pressure (on steam wait for the pipe to heat and expand) until
the desired pressure is reached.
This instruction sheet is intended as general information and is
not to be interpreted as specific information on any particular
application. If, after reading the above instructions, you are
uncertain as to the product's adaptability for your application,
please call factory or authorized representative before installing
or using product.
455
REGULATIN G
VALVE
STRAINER
STEAM
SU PPLY
TYPICAL INSTALLATION
PAGE 37
REVISION 3
TOP DIAPHRAGM CASE
DIAPHRAGM ASSY
DIAPHRAGM*
DIAPHRAGM WASHER
DIAPHRAGM CASE NUTS
& BOLTS
BOTTOM DIAPHRAGM CASE
REGULATING SPRING
STUDS & NUTS
SPRING YOKE
REGULATING NUTS
DIAPHRAGM STEM ASSY
DIAPHRAGM STEM
DIAPHRAGM WASHER
STEM LOCK NUT
PACKING ASSY
PACKING*
PACKING NUT
PACKING GLAND
MAIN VALVE ASSY
MAIN VALVE
MAIN VALVE SEAT
PILOT VALVE & STEM
PILOT VALVE STEM NUT
VALVE BODY
BOTTOM PLUG
*Recommended Spare Parts
10 PIPE DIAMETERS MIN.
NEEDLE
VALVE
RELIEF
VALVE
BY-PASS
LINE