Key Parameters & Specifications Parameter / Feature Category Description Product Name Fisher™ 4195K Pneumatic Actuator Type Spring-and-Diaphragm, Scotch-Yoke, Rotary Actuator Primary Function To provide rotary torque for operating quarter-turn valves (ball, butterfly, plug). Actuator Type Spring-Return (Fail-Safe). Double-acting models are available in the 4195 series without the "K" suffix. Input Signal Standard: 3-15 psig (0.2-1.0 bar) or 6-30 psig (0.4-2.0 bar). Supply Pressure Up to 100 psig (7 bar) for the spring-return model. Housing Material Aluminum (corrosion-resistant). Torque Output Provides high torque output. Exact values depend on the actuator size (e.g., 60, 70, 80, 90, 100) and supply pressure. (Consult the specific data sheet for torque curves). Standard Rotation 90° quarter-turn. Action Field-reversible between direct and reverse action. Fail-Safe Action Spring-Return. The valve fails to the position determined by the actuator orientation (fail-open or fail-close). Temperature Range Standard: -20°F to 180°F (-29°C to 82°C) with standard lubricant and seals. Mounting Designed to mount to valves with ISO 5211 mounting pads. Uses a standardized mounting kit system. Accessory Ports Prepared for the installation of accessories such as: • Limit Switches • Solenoid Valves • Positioners (e.g., Fisher 3582 or a FIELDVUE DVC)