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Keckley Water Pressure
Regulators
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Keckley
Water
Pressure Regulators
 Spring Diaphragm Type Adjustable Spring
Range 8-30; 28-50; 45-75; 70-100
Service: The Type 700 is an
improved design of the best type of water pressure
reducing valve in small sizes for silent, dead end
operation, especially for supplying low or medium water
pressure to buildings from high pressure city water
mains. Because they are dependable, tight closing,
compact, and rarely require attention they are in use for
fresh and salt water systems on many naval and merchant
ships. No. 700 valves are made for initial pressures up
to 300 psi. The delivery pressures are sufficiently high
for ordinary service water uses but limited only to
insure long diaphragm life, good regulation and to avoid
damage to plumbing fixtures.
Construction: In the design of these valves
special attention has been given to providing large flow
passages-, rugged construction for durability and to
assure perfect alignment and free operation under pipe
strains; accessability for replacement of the rubber
disc, diaphragm, or leather cup without removing from the
line-, and a better spring design for constant pressure
over a wide range of capacity.
Standard valves
have bronze bodies and cast iron spring chambers in size
1112 inches and smaller, cast iron bodies and spring
chambers in the larger sizes, with bronze trim in all
sizes. For marine service the bodies and spring chambers
are usually bronze in all sizes with an extra charge for
sizes above 1112 inches.
Operation: The inlet water pressure acts
upward on the piston (sealed by a cup leather) and
downward on the disc holder carrying a rubber ring disc.
The inner valve is consequently balanced and unaffected
by changes in inlet pressure.
The valve is held open by the spring until the
delivery pressure, transmitted through the diagonal
drilled hole to the space under the diaphragm, is
sufficient to lift the diaphragm and pull the valve
closed.
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