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.