AUMA launches explosion-proo f variable speed actuator s

lectric actuator manufacturer AUMA has launched explosion-proof variable speed valve actuators for use in


potentially hazardous environment. The new SAVEx actuators for open-close duty and SARVEx multi-turn actuators for modulating duty, combined with intelligent ACVEx actuator controls, provide full control of the motor speed at any

Vari advant Safefe, easy & convenient

lackfast’s room temperature blacking process is both safe, easy and convenient to use. The process has been developed for safe and reliable use in metal working facilities, so it is no longer necessary for parts to leave the production site for finishing by an outside contractor. Unlike conventional method

B non-hazardous. Blacking of iron and steel p

rovides a corrosion resistant s of blacking it is

finish without dimensional change. This is attractive for machined parts manufactured to tight tolerances, where plating or painting would not be acceptable.

As it is very important that the components are clean and free from grease before using the blacking process, Blackfast also offers a range of degreasers from solvents to water based and rust removers.

B ackfast Chemicals Ltd

Blackfast Chemicals Ltdl  020 8339 7370

ages for challenging valve control able speed offers significant time.

tasks, since it allows the optimum

operating speed to be selected for each change of valve position. High positioning accuracy and optimised setpoint control considerably increase the effectiveness of pressure control valves in gas pipelines, for example. On multiport valves, variable speed actuators aid rapid and accurate switch-over between ports. Mechanical stresses on valve, actuator

and pipeline are minimized by reducing the operating speed close to the end positions, allowing the moving element of the valve to make gentle contact with the seat. Pressure surges and cavitation effects in the pipeline can be avoided by using speed profiles.

When working in modulating duty, the actuator speed can be set to reduce progressively as the valve position approaches the setpoint, giving a significant increase in positioning accuracy.

Actuator speed can also be controlled by an external signal – either 4–20 mA analog or 0–100 % digital – to take full advantage of additional control variables or algorithms. A further option is speed synchronisation between two actuators.

and 24 range.

AUMA’s new explosion-proof SAVEx and SARVEx actuators complement the weatherproof SAV and SARV type They are available in six sizes covering torques up to 1,000 Nm. Speed ranges include 6–60 rpm, 12–108 rpm –116 rpm.

AUMA Actuators Ltd AUMA Actuators Ltd..  01275 871141 

ABB drives eliminate burst pipes at ScottishWater pumping station

Scottish Water, a utility providing water and sewerage services across Scotland, suffered nine pipe bursts per year, on average, at its Castle Road pumping station. Each burst was estimated to cost £1,400 through leakage detection, repair materials and labour.


The bursts were caused by pumps being started direct-on-line (DOL). This crude start/stop control created pressure waves causing pipes to fracture and leak. For example, water may be moving at a flow rate of 10 metres per second. If the pump is then switched off, this moving water suddenly hits a dead end, surging back, shocking the network.

EDC (Scotland) fitted two 5.5 kilowatt (kW) ABB water and wastewater drives, one for each of the two booster pumps. The drives provide a soft ramp up and a controlled slow down to maintain supply pressure in the pipe network. The project was completed in two stages to ensure no disruption to public water supplies.

Data loggers were used to gather information on pressure transients around the Castle Road site. Before the ABB drives were installed, the data revealed that on DOL starting, pressures were peaking at 140 metres head. Following installation of the drives, pressure data was again logged, revealing that starting and stopping the pumps using the VSDs reduced maximum pressures to 83 metres head.

investment in drives was achie also reduced the energy consu

ABB Ltd. 46 MARC


Since the installation was commissioned in November 2016, the utility has had zero pipe bursts. The VSDs have mption of the pumps, saving an additional £200 per year. The return on the £5,500 ved in five-and-a-half months.

 01925 741 111 CONNECTIN DNI


ver £12,000 in maintenance costs is saved per year by eliminating burst pipes through the installation of ABB drives on two booster pumps.

Optimise your pipework with swivels

otaflow design and manufacture a range of swivels joints. Swivel Joints allow fluids to be transferred across rotating interfaces, without leakage.


Simple single flow units are used in many articulated pipework and hose reelers. Some applications require articulated pipe work or hoses to allow fluids; such as Hydraulic Power, Air (pneumatic) control lines, or mixed process fluids to be used on moving machinery. Swivel joints will allow the movement on a slowly rotating drum or remove the damaging effect of twisting on hoses. The strong bearing area, of both ball bearings and needle rollers, is complimented with a choice of sealing materials for maximum application compatibility. Over th e passed 35 years Rotaflow have provided design solutions within many processing sectors.

This multiport unit has been designed to enhance the productivity, reliability and reduce downtime in a cylinder filling plant with Calor Gas.

Rotaf o flol w FV L FV Ltd

 01663 735003 



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