Water Hammer Arrestors - Stainless Steel

Lead-Free 316 Stainless Steel Water Hammer Arrestors are precision-engineered devices designed to eliminate pressure shock and pipe banging in commercial and industrial fluid systems. Engineered with corrosion-resistant 316 stainless steel bodies and lead-free construction, these arrestors provide reliable protection in water, chemical, deionized, and petroleum systems where standard brass or copper models are unsuitable.

These devices mitigate the destructive phenomenon of water hammer—a pressure surge caused by the sudden stop or change in direction of a flowing fluid. The arrestor's internal mechanism uses a pre-charged air or nitrogen cushion to absorb shock energy, protecting system components, reducing noise, and preventing pipe joint failure.

Technical Specifications and Customization
These water hammer arrestors are available in a full range of National Pipe Thread (NPT) sizes from 1/2-inch to 2-inch, corresponding to standard Plumbing and Drainage Institute (PDI) sizes A through F. Unlike standard residential units, these 316 stainless steel arrestors are engineered to order based on specific system parameters.

• Fluid Compatibility: Suitable for aggressive fluids including chemicals, petroleum products, deionized water, and standard potable water.

• Factory Charging: Units can be factory-charged with either air or dry nitrogen, with nitrogen being mandatory for systems containing volatile fluids.

• Ordering Specifications: To manufacture a unit, the expected mean spike pressure, fluid chemical composition, and maximum system temperature must be specified.

Certifications and Installation
The arrestors meet critical industry standards for performance and safety. They are PDI certified according to the relevant WH-201 standard, confirming their capacity and performance for specific fixture units. The lead-free construction complies with U.S. regulations for potable water applications (such as those referenced by ANSI/NSF 61 and 372). For installation, they are designed for vertical or horizontal orientation and connect directly into the line using their threaded ends, typically installed close to quick-closing valves or appliances. A key advantage for commercial spaces is that, once installed and tested, they do not require routine maintenance or access panels, as the sealed air chamber is not user-serviceable.