Specifications

16
MAIN SUPPLY RESET VALVES SELECTOR
Knob Actuator Pilot Actuator
Valve
Sufx
Non-latching Manual Pin Latch Non-indicating Indicating Air Pilot Air Latch Pilot
X X X
-159E
(page 17
)
X X X
-301ES
(page 18)
X X X
900N
(page 18)
X X X
900A
(page 17)
X X X
900
(page 18)
X X X
900P
(page 17)
X X X
900W
(page 18)
X
Manually resets valve
plus, a built-in pilot
(separate from Air Latch
Pilot) enables valve to
be reset from a remote
location utilizing a pilot
pressure signal.
X X
900PR
(page 19)
X X
X
Functions same as Air
Latch Pilot, but pilot
signal is controlled by
built-in solenoid.
900G
(page 19)
X X X
900NF
(page 19)
Functions same as Air Latch Pilot plus, will trip if outlet port (which is connected to indicator valve loop) loses pressure, as in the case of a leak
General Description
Series B900 VALVES
STAINLESS STEEL CONSTRUCTION
Main Supply Reset Valves are Manual/Pilot operated, Spring Re-
turn, Three-Way (3/2), normally closed valves that are generally
used to control and monitor the air pressure supply to an instru-
ment control system. Monitoring is accomplished through the
use of a monitor pilot, which is an integral part of the valve and
which reacts to pressure signals from sensors within the system
in order to shut down that specic portion of the system, should
a malfunction occur.
The action of the valve for shut down and the method by which
the control system pressure is restored differentiates the various
Main Supply Reset valves available.
Knob Actuator —
The manual portion of the valve provides a lid knob which can
be pulled out to actuate the valve, in order to start up or reset the
control system pressure. A latch can be provided such that, once
actuated, the valve can be manually latched in the actuated posi-
tion. Unlatching might be accomplished by pulling on the knob or
by applying pressure to the pilot.
An optional visual indicator, which is an integral part of the knob,
can also be provided in order to indicate when pressure in the
pilot chamber is actuating the valve.
All knob actuators are equipped for panel mounting utilizing a
panel mounting nut which is included.
Air Pilot Actuator —
The air pilot portion of the valve is a small cylinder which is an
integral part of the valve. The types available are:
Air Pilot - when pressurized will actuate the valve, and
will unlatch the knob actuator if the latching feature is
included.
Air Latch Pilot - when pressurized will not actuate the
valve until knob is pulled out. Pressure in the pilot chamber
can then hold the valve in the actuated position, and will
unlatch the knob actuator if the latching feature is included.
Main Supply Reset Valves
Construction
Pressure and Media
Temperature Range
Installation, Filtration & Lubrication
Materials
Porting
Versa B900 Valves are spool poppet valves. Standard size O
ring seals, placed in accordance with Versa’s Anti-Extrusion
principle provides long trouble free service with little and easy
maintenance.
Valves have no limitations on mounting orientation. 40-50
micron ltration recommended. General purpose lubricating
oil ISO, ASTM viscosity grade 32 recommended.
- Valve body and actuating caps: 316 stainless steel
- All internal wetted metal parts: 316 stainless steel or NACE
approved materials
- Valve Seals: FKM (Fluorocarbon) O ring seals
- Screws: stainless steel
- Valve ports are 1/4 NPT; Pilot ports are 1/8 NPT
- Flow area/Cv; consult factory
- 0 to 200 psig (14 bar); Air or Hydrocarbon gases or other
gases compatible with materials used.
- Pressures for Pilot: see pages pertaining to specic valve.
Medium/Ambient temperature: -10°F (-23°C) to 200°F (95°C)