Fisher 167DA-85 Aluminium Switching Valve Airlock Manifold
The Fisher 167DA-85 Switching Valve (also referenced as 167DA-85/CB) is a two-way, pneumatic airlock and pressure-sensing switching valve manufactured by Emerson under the Fisher brand.
- 10.3 bar (150 psig) Maximum Operating Pressure
- Cv 0.60 Flow Coefficient
- 1/4 Inch NPT Female Port Size / Connections
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Product Overview
The Fisher 167DA-85 Switching Valve (also referenced as 167DA-85/CB) is a two-way, pneumatic airlock and pressure-sensing switching valve manufactured by Emerson under the Fisher brand. Engineered for fail-safe pneumatic control valve automation circuits, this direct-operated diaphragm valve senses instrument air supply pressure and trips when supply pressure drops below a calibrated threshold. Upon tripping, it redirects pneumatic supply, vents actuator loading pressure, or locks the actuator in its last operating position to maintain plant safety.
Built with a rugged die-cast aluminium body and spring casing, the 167DA-85 incorporates an internal sensing diaphragm, a precision stainless steel spring, and a resilient soft seat plug to ensure positive shutoff and bubble-tight sealing. The switching setpoint is easily calibrated in the field via an external adjustment screw with a secure locking nut. Its corrosion-resistant aluminium construction, standard 1/4-inch NPT pneumatic connections, and dependable trip repeatability make it an essential fail-safe control component across oil and gas refining, chemical manufacturing, power generation, and offshore automated valve assemblies.
Technical Specifications
| Specification | Value |
| Product Name | Pneumatic Switching Valve / Airlock Valve |
| Manufacturer / Brand | Fisher / Emerson |
| Model / Part Number | 167DA-85 (167DA-85/CB) |
| Product Series | Type 167DA Series |
| Valve Function | Two-Way Pneumatic Switching / Trip Valve |
| Body & Spring Case Material | Die-Cast Aluminium Alloy |
| Port Size / Connections | 1/4 Inch NPT Female |
| Maximum Operating Pressure | 10.3 bar (150 psig) |
| Adjustable Trip Pressure Range | 1.4 to 6.9 bar (20 to 100 psig) |
| Sensing Mechanism | Internal Molded Diaphragm |
| Diaphragm Material | Nitrile Rubber (NBR) with Fabric Reinforcement |
| Valve Disc / O-Ring Material | Nitrile Rubber (NBR) |
| Trim / Valve Plug Material | Brass / Stainless Steel |
| Operating Temperature Range | -29°C to +82°C (-20°F to +180°F) |
| Optional Low-Temperature Range | Down to -54°C (-65°F) with Fluorosilicone Trims |
| Setpoint Adjustment | External Adjustment Screw with Locknut |
| Flow Coefficient | Cv 0.60 |
| Mounting Orientation | Mountable in Any Orientation (Upright Recommended) |
| Operating Medium | Clean, Dry Compressed Instrument Air, Non-Corrosive Gas |
| Approximate Net Weight | 0.85 kg (1.87 lb) |
| Condition | New |
| Warranty | 1 Year |
Key Features
Direct-operated pneumatic switching provides fast, automatic trip response on air pressure loss
Engineered for pneumatic airlock fail-in-place and emergency venting valve circuits
Rugged die-cast aluminium housing delivers impact resistance and corrosion protection
Wide adjustable switching setpoint range from 1.4 to 6.9 bar accommodates various supply limits
Fabric-reinforced nitrile diaphragm ensures high sensitivity, low hysteresis, and long cycle life
Resilient soft seat design provides bubble-tight internal shutoff and minimizes air leakage
Standard 1/4-inch NPT threaded female connections facilitate simple in-line or bracket mounting
Positive locking nut secures the calibrated setpoint against heavy industrial pipeline vibration
Compatible with single-acting and double-acting linear and rotary pneumatic actuators
Typical Applications
Airlock fail-safe systems locking pneumatic actuators in their last position upon pressure loss
Pneumatic trip circuits initiating automated valve shutdown or fail-open procedures
Switching pilot pressure between primary and secondary pneumatic instrument supply lines
Chemical and petrochemical processing automated control valve safety circuits
Oil and gas upstream production platforms, gas manifolds, and refinery units
Power plant boiler feedwater regulation, turbine bypass, and steam line safety locks
Industrial process automation manifolds requiring pneumatic supply loss detection
Shipping & Support
Fast dispatch: Australia & Worldwide Shipping
Technical assistance available
1-year warranty
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