PNEUMATIC CONTROL
VALVES
 Mazda
SR 300 pneumatically operated globe valves
are designed for process control of high/low
pressure steam, clean dirty, corrosive liquids
and gases. They are available in sizes ranging
from ½” to 20” in pressure
classes 150 through 2500.
SR 300 control valves are
supplied with either piston cylinder or
spring & diaphragm actuator (direct
or reverse acting) and a number of optional
accessories to suit the duty requirement.
These valves permit field interchangeability
of actuator and trim types, thus proving
to be economical in case of field conversion
In continuation to Mazda's
traditional success in process control application,
SR 300 provides optimum solution to the
needs of the Fertilizer, Petrochemical,
Refinery, Chemical, Power, and other process
industries.
Body:
Variety of standard (reversible)
body material are available to suit the
duty conditions. They are Cast Steel ( A
216 WCB) Stainless Steel (A 351 CF 8/8 M)
Chrome-Molly (A 217 WC1,6 & 9), Hastelloy
(A 494), Monel (A 296) or Alloy 20 (A 351
GR CN 7M). The body and bonnet are built
as per ANSI standard. The extra wall thickness
provide strength and corrosion allowance.
Bonnet:
Mazda control valves are fitted
with different types of bonnet. For general
applications, plain bonnet are incorporated
and for operating temperatures beyond 235
deg.c finned (radiator) bonnets are provided
for dissipation of heat. In order to protect
the packing gland from extreme cold, in
case of cryogenic service, extended bonnet
can be fitted.
Trim:
The trim being responsible for
the control of fluid process, is the most
important assembly of a control valve. It
is expected to give long trouble free operation
without a damage, owing to wire drawing,
cavitation, vibration (noise). At the same
time, the selection of proper trim characteristic
is equally responsible to get the desired
performance. Mazda offers variety of trim
options depending on the application. They
are modified Parabolic, Linear, Quick Acting
or Equal Percentage. Standard trim components
like plug, seat, cage and cylinders are
410/420 (hardened) SS Alloys, Optional materials
are stellited.
Packing:
Regular packing material are PTFE
& Graphite Asbestos. However, for most
applications like steam and other hazardous
fluids, Grafoil (pure graphite) is recommended
by Mazda. Grafoil contains no resins/binders
or fillers and offers outstanding high temperature
characteristics.
Actuators:
Our experience shows that the control
valve with pneumatic piston cylinder actuator
gives the best performance. This control
valve with valve positioner has a very high
frequency response and positioning accuracy.
However, if required we can supply control
valves with spring and diaphragm actuator.
*
On Request Product Catalogue Available |
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