- Semi-steel bodies suitable for 250 PSI
steam working pressures.
- Standard flanged or screwed end semi-steel
bodies up to 150 PSI steam pressure.
- Extra Heavy flanged or screwed end semi-steel
bodies up to 250 PSI steam pressure.
- The No. 205 Regulator is not recommended
for reduced pressures lower than 5 PSI or inlet pressures under
Service: The No. 205 Regulator is
a sensitive, internal pilot operated valve suitable for regulating
steam, air pressures. It is recommended for high pressure power
plant service and performs excellently wherever extreme fluctuations
occur in the initial pressure but not permitting variations in the
service pressure. Where dead-end service is required the No. 205
Regulator is recommended because, being of single-seat construction,
it is "bottle-tight" when closed. Thus the pressure on
the service side cannot build up beyond the point for which it is
set. The parabolic shaped main disc tends to prevent excessive wire-drawing
because, due to design, the steam is deflected beyond the seating
Construction Features: The body is
constructed of semi-steel and may be ordered with either stainless
steel trim. The valve is operated by slight movements of a Metal
Diaphragm. Regulators are equipped with high-grade 302 Stainless
Steel compression springs calibrated to respond to the slightest
variation in pressures. The No. 205 Pilot Valve is self contained
with all moveable parts interchangeable and easily replaced without
removing the valve from the pipe line. When reduced pressures are
exceptionally low for this type of valve, a large diaphragm chamber
is used to facilitate and insure accurate regulation.
The pressure on the service side is regulated
by one spring. The cylinder is suspended from the top, and the entire
design is such as to compensate for the various coefficients of
expansion of the different metals. Consequently, the possibility
of moving parts sticking and binding due to changes in temperature
Operation: When in service the diaphragm
is controlled by the reduced pressure operating against the top
loading spring. The auxiliary valve is then actuated and pressure
is applied to the piston which has a greater area than the main
valve disc. A small variation of the reduced pressure causes the
auxiliary valve to open or close in varying degrees. This action
is transmitted to the piston and on to the main disc to effect the
throttling action necessary to maintain a constant reduced pressure.
When Ordering: Specify valve size, body
material and trim, screwed or flanged body and maximum and minimum
volume required, if available. State initial and reduced pressures,
and if flanged specify drilling.
( With Adjusting Stem )
When conditions exist that make it imperative
to install a Figure No. 205 Pilot Regulating Valve larger than is
required for present load requirements, the Adjusting Stem unit
is a valuable adjunct to the efficiency of operation. As is sometimes
the case, a valve is installed to care for future conditions not
exisitng at the time of installation. Consequently, by virtue of
a minimum load requirement, the Regulator tends to be noisy and
objectionable, and lessens efficient control. When such is the case,
the Adjusting Stem is strongly recommended.
It will be noted that no additional fittings are
required for installation. This new feature is designed to fit onto
the Bottom Cover of the Regulator as an integral part thereof.