Emerson Fisher 167DA-85 Lock-Up Valve with 125 PSI Max Supply Pressure
FISHER 167DA-85: Three-way switching valve, 400 psig max inlet, 40-125 psi spring range, lock-up function.
Product Details
FISHER 167DA-85 is a three-way pneumatic switching valve designed for high-pressure control and switching applications in industrial pneumatic control systems. Manufactured by Emerson, this valve is specifically engineered for lock-up (LOC) functionality, maintaining or switching pneumatic pressure states to provide fail-safe protection for control valve actuators when instrument air supply is interrupted or falls below the setpoint.
The 167DA-85 features a compact design with port connections of 1/4 or 1/2 NPT for ports A and C, and 1/4 NPT for the vent and control pressure port D and port B. It has a maximum inlet pressure of 400 psig (27.6 bar) with a maximum supply pressure of 125 psi. The spring A/C pressure range is 40-125 psi, while the spring B pressure range is 40-90 psi, allowing flexible configuration for various application requirements.
Key features include internal pressure sensing for simplified installation, easy and accurate adjustment, and durable construction with corrosion-resistant fasteners. The temperature capability ranges from -29°C to 82°C (-20°F to 180°F) with standard bolts, and down to -40°C (-40°F) with optional stainless steel bolts. Optional FKM (Viton) seals extend the temperature range to 149°C (300°F). The 167DA-85 has an approximate weight of 1.2 lbs (0.5 kg), making it lightweight and easy to install. Typical applications include valve actuator control, pneumatic signal switching, safety shutdown systems, and process isolation in oil and gas, chemical processing, and industrial manufacturing facilities.
