Water hammer is a pressure surge generated when fluid flowing through pipe or tubing—generally with high velocity or momentum—suddenly stops, usually due to a valve suddenly closing. It is also called hydraulic shock. Water hammer often causes an annoying banging noise, but the resulting pressure spike can also damage gauges, floats and fittings and even burst hoses and pipes.
New IMI Norgren 82410 and 82740 solenoid valves from IMI Precision Engineering, Littleton, Colo., are said to substantially reduce such pressure spikes. The 2-way solenoid valves solve the problem with a proprietary internal design that lets them close smoothly and gently, preventing large pressure spikes while still maintaining fast closing speed. Tests conclude these valves reduce water hammer by up to 80% compared with similar solenoid valves, eliminating the need for costly remedial measures.
The 82410 valve comes in brass; the 82740 version is made of 316 stainless steel for use in more-aggressive operating environments. Both readily install in new equipment or as replacements to upgrade existing systems. According to the company, they’re suited for any application that starts and stops water flow and is vulnerable to shock and damage, such as dental offices, factories and process plants as well as mobile equipment like concrete mixers.
IMI Precision Engineering
Filed Under: Valves & Manifolds