Fisher 167DA Series Switching Valve Three-way Pressure Reducing
Regulator Valve
Fisher 167DA Series Switching Valve is a three-way valve typically used to deliver constant reduced pressure of gaseous fluids to pilot
operated controllers and other pneumatic instrumentation.
The Types 167D and 167DS are two-way switching valves.
The Types 167DA and 167DAS are three-way switching valves.
Features:
Compact—The Types 167D and 167DA switching valves are engineered for
outstanding performance in a compact, light weight package.
Easy, Accurate Adjustment—With a choice of springs for optimum resolution, the switching
point is set to a specifi c requirement by an adjusting screw atop
the spring case.
Sour Gas Service Capability—NACE MR0175 and MR0103 compliant construction available.
Optional Stainless Steel Construction— The Types 167DS and 167DAS provide high resistance to corrosion
especially benefi cial for offshore applications.
Ease of Maintenance—No special tools are required to perform maintenance, and all
maintenance can be performed with the valve in the line.
Rugged Construction—The Types 167D and 167DA switching valves are engineered for
longer service life with minimal maintenance requirements.
Corrosion Resistant Fasteners—Bolting and adjusting screw are double zinc-chromated for enhanced
corrosion resistance. Optional stainless steel bolting and
adjusting screw are also available.
Specifications
Available Configurations
Types 167D and 167DS: Two-way switching valves
Types 167DA and 167DAS: Three-way switching valves
Body Size, Inlet, and Outlet Connection Style
Ports A and C: 1/4” or 1/2” NPT
Vent and Control Pressure Connections (Port D) and Port B: 1/4 NPT
Construction Materials
See Table 4
Maximum Operating Inlet Pressure(1)
Types 167D and 167DS: 400 psig / 27,6 bar
Types 167DA and 167DAS: 125 psig / 8,6 bar
Types 167DA and 167DAS (NACE): 100 psig / 6,9 bar
Set Pressure Ranges
See Tables 1 and 2
Maximum Diaphragm Pressure(1)
150 psi / 10,3 bar over outlet pressure setting up to a maximum of
250 psi / 17,2 bar
Flow and Sizing Coeffi cients
See Table 3
Spring Case Vent Location
Aligned with inlet standard, other positions optional
Temperature Capabilities(1)
Nitrile (NBR)
Standard Service (Types 167D and 167DA only): -20° to 180°F / -29°
to 82°C
Low Temperature Service (Types 167D and 167DA only) and Standard
Service (Types 167DS and 167DAS only): -40° to 180°F / -40 ° to
82°C
Fluorocarbon (FKM)
High Temperature Service: 0° to 300°F / -18° to 149°C
Installation
The switching valve can be mounted in any position, providing the
vent in the spring case is free from obstruction. Connect the
pneumatic control line to the port marked “D” on the valve body.
Ports A and C (and B on the Types 167DA and 167DAS valve) are
connected for the desired switching valve response to loss or
decrease in pneumatic pressure. Figure 5 shows typical application
of the Types 167DA and 167DAS switching valve. If the control valve
inlet pressure falls below a predetermined setting, the on-off
controller turns off control pressure to the switching valve. This
causes the switching valve to bleed the control valve diaphragm
pressure to atmosphere, closing the control valve. The control
valve remains closed until the inlet pressure is restored to the
desired setting.
