Water & Wastewater Treatment Magazine
Issue link: https://fhpublishing.uberflip.com/i/1083348
Valworx PVC air actuated diaphragm valves Valworx has introduced a new line of pneumatic PVC Diaphragm Valves, featuring a high-fl ow, weir-style body design and especially suited for abrasive or dirty fl uids. The valves, sized from half an inch to 2 inches, come in in EPDM, PTFE, and FPM materials. Valworx 5245 True Union PVC diaphragm valves are typically used for on-off control of abrasive or liquids with suspended solids and other media compatible with the materials of construc- tion. The spring return (normally closed) actuators use air pressure to open the valve and springs or pistons to close. Compressed air must be fi ltered dry or lubricated. OTHER TOP PICKS FOR VALVES Next month: Tanks THE DETAILS AVK Series 872 needle valve ● designed for regulation or throttling of water at high fl ow rates and pressure in piping systems for water supply● low maintenance● sizes from DN80 to DN2000● pressure ratings up to PN100 What is it? Needle valves, sometimes referred to as plunger valves, enable engineers to fi nely control fl ows. This precision is achieved through the fi ne movement on the needle/plunger, which enables the gearbox to open or close the internal sleeve in small and accurate increments to the desired position. What's good about it? AVK needle valves are designed to off er very precise control. They require very low operating torques as they are always in hydraulic balance – meaning there are equal and opposite forces at play internally at all valve positions – which signifi cantly reduces actuator and gearbox costs. The focus is on durability and reliability, with the sturdy valve housing made of either stainless steel for or ductile iron coated with fusion-bonded epoxy. What do they say? AVK technical manager Greg Morris: "We actively encourage customers to take advantage of our technical know-how and practical experience when specifying needle valves. We can advise on the size of valve needed as well as optional extras, such as anti-cavitation devices, are required." The Knowledge Products: Valves Bonomi Valpres range Valve specialist Bonomi (UK) has extended its range of Valpres products with the introduction of new Stainless Steel (723100) and Carbon Steel (724100) 2-way fl anged direct mount wafer pattern ball valves. Featuring an ISO 5211 Direct Mounting pad that allows actuators to mount straight on to the valve, the new wafer ball valve eliminates the require- ment for an additional valve mounting kit. Operational within a temperature range of between -20°C to +160°C and available in sizes 1" to 4", these full-bore fl anged ball valves (PN16 or ANSI 150) are available in stainless steel CF8M or carbon steel LCB and supplied complete with antistatic device. Rotork CMA range Rotork has extended its CMA range of compact modu- lating actuators with new sizes specifi cally designed for reliable automation of larger linear control valves. The new actuator is capable of a maximum 4,500 lbf (20 kN) seating thrust. The new sizes increase the CMA range modulating thrust performance to 3,000 lbf (13 kN) with a 114.3 mm (4.5") stroke length for the automation of larger valves with higher pressure ratings. The combined performance of the CMA and the larger CVA ranges enables Rotork's innovative electrical control valve actuation technologies to be applied to process con- trol applications of virtually any size and description. PRODUCT OF THE MONTH 30 | MARCH 2019 | WWT | www.wwtonline.co.uk