Electric failsafe actuator
June 2005
Valves, Actuators & Pump Control
Yokogawa SA is the sole distributor for Kinetrol in Africa. One of the products it offers is an electric failsafe actuator. This is an actuator that works with an electric hydraulic control system. This makes a solution for areas where there are no pneumatic supplies to operate a pneumatic actuator.
An electronic circuit and feedback potentiometer are fitted inside the standard actuator control box. The circuit includes a high stability linear comparator, which switches the actuator pump and solenoid valves via solid-state mains switches in response to the difference between the actual position measured by the potentiometer and the intended position given by the 4 to 20 mA signal. Limit switches prevent the actuator driving against its own end stop, whatever the signal may be. The positioner mains switches are optically isolated from the low voltage DC control circuit, which is electrically isolated from the rest of the actuator.
The feedback potentiometer is a conductive plastic servo-type unit driven by a backlash-free drive. The positioner circuit is mounted inside an insulating polymer box for safety; it is fitted with screwdriver adjustable potentiometers to allow customer turning of zero, gain and bandwidth.
The efficient design of the Kinetrol EHD actuator allows a high start frequency to be achieved, without overheating. The positioner is available on fail-safe spring return and double-acting units, and gives accurate, linear low hysteresis performance with excellent thermal stability. The intrinsic stiffness of the hydraulic system together with the backlash-free design of the Kinetrol vane actuator makes this positioner tolerant of varying or unstable loads. The complete absence of separately mounted enclosures makes installation neat, simple and economical - all external connections for power, signal and limit switches are made to normal connector block in the control box. Applications for Kinetrol Actuators would include any ¼ turn applications eg, ball valves, butterfly valves and dampers. Kinetrol also has a range of pneumatic actuators for ¼ turn applications.
For more information contact Zjaan Haarhoff, Yokogawa SA, 011 681 2560, [email protected], www.kinetrol.com
Further reading:
Duplex valve improves continuous production at Gauteng manufacturing facility
Valves, Actuators & Pump Control
In a recent installation at a Gauteng-based manufacturer of household and personal care products, Allmech provided a tailored water treatment solution to ensure a consistent supply of soft water for steam generation, an essential element in the client’s 24/7 production cycle.
Read more...
Ultra-durable stainless steel submersible pumps
Valves, Actuators & Pump Control
KSB Pumps and Valves has launched a rugged stainless-steel submersible pump range designed for deep borehole use and other demanding freshwater and saline pumping applications.
Read more...
Industrial valve solutions
Bearing Man Group t/a BMG
Valves, Actuators & Pump Control
BMG’s Fluid Technology division supplies and supports an extensive range of components for fluid technology systems. These include valves, hydraulic hoses and fittings, accumulators, cylinders, heat exchangers, hydraulic motors and hydraulic plumbing, as well as pumps and reservoir accessories.
Read more...
New wastewater pump for local municipalities and industries
Valves, Actuators & Pump Control
The latest wastewater pump from KSB Pumps and Valves is making waves in the industry due to a host of new features that provide users with an ultra-durable long service pump with fewer blockages and a lower maintenance requirement than traditional pumps.
Read more...
The critical role of check valves in fluid systems
Valves, Actuators & Pump Control
In fluid power systems, the performance and reliability of the entire operation often hinge on components that are small in size but significant in function. Among these, the check valve stands out as a fundamental yet frequently overlooked element.
Read more...
ENERGYValves expands operations
Valves, Actuators & Pump Control
ENERGYValves is expanding its operations with a new facility in Cape Town. The new premises will significantly enhance the company’s capacity to serve the Cape Town market and surrounding areas.
Read more...
Pumps lead the way with advanced technology
Valves, Actuators & Pump Control
The KSB GIW MDX pump has consistently represented a major leap forward in mill duty applications, with KSB relying on customer feedback to improving the design continuously.
Read more...
Wireless leak detection valve
Valves, Actuators & Pump Control
Designed to prevent water leakage by automatically shutting off the water supply when a leak is detected, the Runxin F104 wireless leak detection valve is one of the latest offerings from Allmech.
Read more...
Ball valves and actuators optimise HVAC performance
Schneider Electric South Africa
Valves, Actuators & Pump Control
Schneider Electric offers the full range of innovative SpaceLogic and EasyLogic ball valves and actuators. These cutting-edge products are designed to optimise HVAC system performance, ensuring comfort and energy efficiency in commercial and residential buildings.
Read more...
Alfa Laval expands hygienic valve portfolio
Valves, Actuators & Pump Control
Alfa Laval is expanding its hygienic valve portfolio by introducing the Unique SSV pressure relief valve and the Leakage Detection butterfly valve, alongside new smaller sizes of the Unique Mixproof CIP and Unique Mixproof process valves.
Read more...
printer friendly version