Shock AbsorbersWater Hammer Arrestors
When quick-closing valves slam shut, the moving water column stops short and sends a pressure shockwave back through the piping. Josam shock absorbers place a sealed, pre-charged air chamber at those trouble spots to soak up that surge, quieting banging pipes and protecting joints, valves, and fixtures from fatigue and failure.
Product Specifications
Key Features
Common Applications
Shock Absorber FAQs
Common questions about Josam Shock Absorbers
Water hammer is a pressure surge that occurs when water flow is suddenly stopped, causing a shockwave that can damage pipes, fittings, and fixtures.
Shock absorbers contain a cushion of air or gas that absorbs the pressure surge when water flow is suddenly stopped, protecting the plumbing system.
Place arrestors as close as practical to the quick-closing valves that cause the surge, such as solenoid valves on washing machines, dishwashers, flush valves, and commercial laundry or food-service equipment. Mounting them at the end of the branch nearest the offending valve gives the best protection.
Arrestors are sized to the fixture-unit load on the branch they protect using the PDI-WH 201 sizing letters (A through F). Josam shock absorbers are offered across that range so the unit can be matched to the pipe size and the number of fixtures it serves.
No. Unlike a plain capped-pipe air chamber that eventually waterlogs, a sealed mechanical arrestor keeps its air or gas charge isolated behind a piston or bellows, so it stays effective without the manual draining and recharging older air chambers required.
Where Water-Hammer Arrestors Are Needed
Related product types
- Valves & backflow products — related water-control and protection components.
Common applications
- Hotels & resorts — protect risers serving many quick-closing valves.
- Hospitals — surge protection for critical plumbing systems.
- Commercial kitchens — arrest hammer from solenoid-valved equipment.
Need Water Hammer Protection?
Josam shock absorbers protect plumbing systems from damaging pressure surges.