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ADVERTORIALS
TECHNOLOGYIN ACTION
Variable speed actuation promotes calm networks and reduced maintenance
AUMA Actuators Limited offers a range of high performance actuator solutions capable of accurately controlling the opening and closing speed of valves and penstocks, delivering significant benefits in terms of flow control, reduction of water hammer and calm network performance. Water hammer can be a significant issue in
Cat Pumps Pressure Regulators
Cat Pumps (U.K.) Limited are well known for high-pressure triplex plunger pumps but are also becoming known as the product of choice for our range of high-pressure regulators. Cat Pumps® regulators have advances in regulator technology that
offer superior operating performance (especially in arduous conditions) and ensure a smoother, longer lasting,more precise pressure regulation of high-pressure liquid systems.
Benefits: • Extensive flow range and high-pressure capability. • Conical design lowersminimum required bypass flow from 10 to 5%, which provides more consistent pressure. • Lower override pressure compared to competitive designs provides system protection, reduces wear and energy cost. • Superior valve design provides smooth, stable service with quiet operation and no chatter. • Compact in-line design for easy mounting. • Available in steel/nickel-plated, 304 and 316 stainless steel. • Elastomers are available inmedium nitrile (NBR), fluorocarbon (FPM), and ethylene propylene diene monomer (EPDM).
CAT PUMPS +44 1252 622031
sales@catpumps.co.uk www.catpumps.co.uk
many applications. Valve seats may suffer if they are driven hard to their end positions whenever the valve is closed. A variable speed actuator, gives the control engineer the opportunity to specify the speed of actuation at different points in the cycle. The valve moves quickly through the majority of its cycle, slowing down as it nears the close position, alleviating water hammer problems and extending the life of the valve seat. For emergency situations a ‘fast close’ speed can be specified. AUMA variable speed multi-turn actuators bring together AUMA’s SAV/SARV actuators and ACV 01.2 actuator controls. Variable speed is achieved by the integral frequency converter within the actuator controls. Operations from an end position start at zero speed. Speed is increased by
a ramp function until the predefined value is reached. Soft stop is achieved by linearly decreasing speed prior to reaching the end position. The gentle operation benefits all valve and actuator components subject to wear. Higher positioning accuracy is achieved by decreasing the operating
speed when approaching the valve setpoint position. This ability is particularly important for the SARVmodulating duty model. Closing at excessive speed results in pressure surges and can cause overloads in both valves and pipeline systems depending on flow conditions. Tailored speed profiles within the AC controller are the ideal solution for controlling closing procedures and maintaining pressures within the permissible range. Speed values may be specified for up to ten sections of travel irrespective of the direction of operation. Thus, the operating speed profile can be tailored to the specific valve requirements.
AUMA 01275 871141
mail@auma.co.uk www.auma.co.uk
Cat Pumps Pressure Regulators Cat Pumps®
regulators have advances in regulator technology that offer superior operating performance (especially in arduous conditions) and ensure for a smoother, longer lasting, more precise pressure regulation of high-pressure liquid systems.
Typical Usage: Pressure regulation of high-pressure liquid systems.
Benefits:
• Conical design lowers minimum required bypass flow from 10 to 5%, which provides more consistent pressure.
• Lower override pressure compared to competitive designs provides system protection and reduces wear and energy cost.
• Superior valve design provides smooth, stable service with quiet operation and no chatter.
• Compact in-line design for easy mounting.
Available Materials: • Available in steel/nickel-plated, 304 and 316 stainless steel.
• Elastomers are available in medium nitrile (NBR), fluorocarbon (FPM), and ethylene propylene diene monomer (EPDM).
Cat Pumps — Protecting your Pumping Systems. UK: +44 1252 622031 |
sales@catpumps.co.uk |
www.catpumps.co.uk
©2021 Cat Pumps (U.K.) Ltd. All Rights Reserved. 21067 4/21 Pressure: 7–690 bar | Flow Rate: 0–390 lpm
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