Damcos™ KF/KFR Linear Single-acting Spring-closing Actuators
Get the fail close performance you demand in a versatile and highly reliable actuator with the Damcos KF/KFR linear single-acting spring-closing actuator. Operated by hydraulic pressure, the output spindle is lifted (and the valve is opened) and the spring package is compressed. When released the spindle closes on the valve with end closing thrust (spring) of 1500 – 16500 Nm. In an emergency when the hydraulic pressure is not available, a built-in manual hand pump can operate the KFR actuator.
The Damcos™ KF and KFR Linear Single-Acting Spring-Closing Actuators, developed by Emerson, are compact, powerful, and reliable hydraulic actuators designed for precise and fail-safe linear valve operation. These actuators are specifically engineered for marine, offshore, and industrial applications where safety, dependability, and performance are critical. The KF/KFR actuator series operates using hydraulic pressure to open the valve, while a heavy-duty spring mechanism automatically closes it when the pressure is released—providing a fail-safe closing function in emergency or power-loss conditions. This makes the actuators ideal for emergency shutdown (ESD) and critical control applications where quick, reliable valve closure is essential for safety. Built from high-strength, corrosion-resistant materials, the Damcos™ KF/KFR actuators deliver long service life in harsh marine environments. Their compact and modular design simplifies installation and integration with Damcos™ valve control systems, including LPUs, HPUs, and control blocks. The KFR variant includes an integrated return spring housing for additional protection and durability in exposed installations.
Technical Specification of Damcos™ KF/KFR Linear Single-acting Spring-closing Actuators
- Burst Pressure
- 675bar
- Ambient Temperature
- -20 to +80 deg. C
- Weight
- 6 to 52 kg depending on type
- Oil Displacement
- 0.021 to 0.428 L
- Stroke Height
- 16.25 to 62.5mm
- Hydraulic Media and Viscosities
- Acid-free hydraulic oil 15 to 200 cSt (see recommended oil list)
- Materials of Construction
- Housing in GGG40 – for more detail see Product Data Sheet
Feature of Damcos™ KF/KFR Linear Single-acting Spring-closing Actuators
- Unique and simple design with built-in crossover valve
- No external moving parts during operation
- Built-in hydraulic emergency operation for KFR
- Same unit for several valve sizes
- Easily adapted to all well-known globe valves
- Prepared for direct built-on modular block functions or LPU
- Direct visual position indication
- Electrical on/off or continuous position/indication
- Roust design operates in any kind of marine environment
- Advance your system to gain added functionality such as…
- Flushing valve built into the connection block makes it possible to flush the system without disconnecting pipes, Fail open actuator (KF only)