Electro-Pneumatic Transducers
Type i2P-100
Type 546
Type 646
Type 846

Air Filter Regulator
Type 67CFR

Position Switches
Type 304

Position Transmitters
Type 4200

Switching Valves/Lock-up Valves
Type 164
Type 167
Type 168
Type 377

Volume Booster 
Type 2625 and 2625NS

Electro-Pneumatic Transducers

Type i2P-100

  • Low Pneumatic Supply Consumption
  • Approved for use with Natural Gas
  • High Output Capability and Rangeability
  • Split Range
  • Corrosion Resistant
  • Tolerant of Dirty Supply Medium
  • Easy Maintenance
  • Vibration Resistance


The Type 546 transducer receives a direct-current input signal and use a torque motor, nozzle-flapper, and pneumatic relay to convert the signal to a proportional pneumatic output signal. Nozzle pressure, which operates the relay, is also piped to the torque motor feedback bellows. This provides a comparison between input signal and nozzle pressure and corrects errors in nozzle pressure.


Electro-pneumatic transducers use a patented converter module that converts a 4 to 20 milliampere input signal to a proportional 3 to 15 psig (0.2 to 1.0 bar) pneumatic output signal. Small size. Vibration resistance. High output capability. Low air consumption.


Electro-pneumatic transducer accepts an electrical input signal and converts it to a pneumatic output signal. The transducer includes a patented deflector/nozzle design that consists of two nozzles positioned so that the constant air flow exiting the supply nozzle. Vibration resistant. Tolerant of dirty supply air.

Air Filter Regulator

67CFR Instrument Supply Regulator

The 67C Series air pressure regulators are typically used to provide constantly controlled, reduced pressures to pneumatic and electropneumatic controllers and other instruments. These direct-operated regulators are suitable for most air or gas applications.

The 67C Series air pressure regulators are suitable for most air or gas applications. Other applications include providing reduced pressures to air chucks, air jets, and spray guns.


Designed for Digital Instrumentation
Optional Smart Bleed©
Optional Stainless Steel Construction
Compact and Light Weight
No Air Loss
Optional Integral Filter
Optional Internal Relief Valve
NACE Construction Available

Body Size and End Connection Style
1/4-inch (DN 6) NPT
Maximum Inlet Pressure (Body Rating)
All except 67CS and 67CSR:  250 psig (17,2 bar)
Type 67CS and 67CSR: 400 psig (27,6 bar)

Maximum Emergency Outlet Pressure
50 psi (3,4 bar) over outlet pressure setting
Wide-Open Flow Coefficients
Main Valve: Cg: 11.7; Cv: 0.36; C1: 32.2
Internal Relief Valve: Cg: 1.45; Cv: 0.045; C1: 32.8

Pressure Registration
Temperature Capabilities
With Nitrile (NBR):
Standard Bolting: -20° to 180°F (-29° to 82°C)
Stainless Steel Bolting: -40° to 180°F (-40° to 82°C)
With Fluoroelastomer (FKM): 0° to 300°F (-18° to 149°C)
With Silicon (VMQ) Diaphragm and Low Temperature Bolting:
-60° to 180°F (-51° to 82°C)
With Gauges: -20°F to 180°F (-29° to 82°C)

Position Switches

Type 304

Type 304 – Fisher Type 304 and 304L electrical position switches are normally mounted on a control valve actuator to operate alarms, signal lights, relays, motors, solenoid valves, or other equipment.

  • Protection from Harsh Environments
  • Easy to Adjust
  • Application Versatility
  • Easy Maintenance


Type 304 – Product Bulletin


TopWorx is the leader in field networking, valve control, and position sensing solutions for the process industries.For more than fifty years, TopWorx has served the process industries: chemical, food & beverage, hydrocarbon, oil & gas, petrochemical, pharmaceutical, power, pulp & paper, and water & wastewater. We deliver complete solutions marked by outstanding service and backed by industry-leading experience and expertise.


Field Networking

  • Masters & Gateways
  • I/O Modules, Tees & Disconnect Switches
  • HazLink Connectivity Enclosures
  • Power Supplies & Repeaters
  • Cables, Connectors & Cordsets

Valve Control

  • Discrete Valve Controllers
  • Discrete Valve Monitors
  • Sensor-Communications Modules
  • Puck Position Sensors
  • Linear Valve Monitors & Sensors
  • Mounting Kits

Position Sensing

  • 10 Series
  • 20 Series
  • 31, 32, 33, 35
  • 80 Series
  • 70 Series

Position Transmitters


The Type 4200 electronic position transmitter combines Fisher’s field-proven electronic and mechanical expertise in a versatile, accurate instrument that senses the position of a device, and sends a standard (4 to 20 milliampere) output signal to an indicating device. The instrument is available as a transmitter with integral high and low electronic travel limit alarms, as a transmitter only, or with electronic travel limit alarms only.

Switching Valves/Lock-up Valves

Types 164 and 164A Switching Valves

The Types 164 and 164A switching valves are pneumatically operated and controlled units, built with a wide range of capabilities to handle those switching applications that involve venting, on-off control, and failure modes.


  • Versatile
  • Easy, Accurate Adjustment
  • Rugged, Compact Construction

Maximum Valve Body Pressure

  • 250 psig (17,2 bar)

Maximum Diaphragm Pressure

  • 200 psig (13,8 bar)

Temperature Capabilities

  • -20 to 180°F (-29 to 82°C)

Approximate Weight

  • 4 lbs (1.8 kg)


164 and 164A Switching Valve – Bulletins 

164 and 164A Switching Valve – Instruction_Manual

Type 167A Three-Way Switching Valve

The Type 167A three-way switching valve is installed to provide switching or lock-up action in the event that the system operation deviates from normal. The compact size and simplicity of this valve make it especially suitable for field or panel mounting.


  • Convenient Installation
  • Easy, Accurate Adjustment
  • Easy Maintenance

Maximum Inlet Pressure

  • 250 psig (17,2 bar)

Maximum Control Signal Pressure

  • 100 psig (6,9 bar)

Temperature Capabilites

  • Nitrile: -20 to 150°F (-29 to 66°C)
  • Fluoroelastomers: 0 to 300°F (-18 to 149°C)

Approximate Weight

  • 1 pound (0,5 kg)


167A Three-Way Switching Valve – Bulletins 

167A Three-Way Switching Valve – Instruction_Manuals 

Type 168, 168H & 68-2 Three-Way Switching Valves

The Type 168 and 168H three-way, snap-acting switching valves provide fast, positive switching of pneumatic pressures in response to a predetermined change in a pneumatic input signal. These switches can be used to open and close pneumatically operated control valves, to load or exhaust pneumatic systems, or to operate a variety of pneumatic equipment.

The Type 68-2 is a three-way, snap-acting switching valve that forms the valve body portion of the Type 168 and 168H switching valves. A manual reset switch may be adapted to the Type 168 and 168H switching valves to provide for manual reset. An extension of the trip lever allows the Type 68-2 to be used as a manual switching valve.


  • Fast, Positive Switching Action
  • Full Adjustablility
  • Three-Way or On/Off Action
  • Automatic or Manual Reset

Temperature Capabilities

  • -10° to 180°F (-23° to 82°C)

Maximum Allowable Pressure

  • 50 to 150 psig (3,4 to 10,3 bar)

Approximate Weight

  • Type 68-2: 0.5 pound (0,23 kg)
  • Type 168: 3 pounds (1,36 kg)
  • Type 168H: 5 pounds (2,26 kg)


The 377 Series pressure-sensing trip valve is used for control applications where a specific valve/actuator action is required when supply pressure falls below a specific point. When supply pressure falls below the trip point the trip valve causes the actuator to fail up, lock in the last position, or fail down. When the supply pressure rises above the trip point, the 377 Series trip valve automatically resets, allowing the system to return to normal operation. The trip valve can be top-mounted on a manifold, yoke-mounted, or bracket-mounted to match the application requirements.


377 Series Trip Valves (PDF) – Bulletins 

377 Series Trip Valves (Web) – Bulletins 

Volume Booster

2625 and 2625NS

Volume booster used in conjunction with a positioner on a throttling control valve to increase stroking speed. The booster incorporates fixed deadband, soft seat construction and an integral bypass restriction to eliminate positioner saturation problems that can occur with volume boosters that do not have these features. Fast response. Adjustable response. Efficient operation.