L-Pattern Stainless Steel Anti Water Hammer Surge Arrestor – Z-Tide Industrial ALF-S Series
The Z-Tide Industrial ALF-S Series is a premium L-pattern anti water hammer surge arrestor designed to protect high-pressure water systems against hydraulic shock while providing exceptional corrosion resistance for demanding industrial environments. Manufactured from 304 stainless steel, the ALF-S Series combines a pre-charged diaphragm air chamber with a patented flow-directing impeller to rapidly absorb pressure surges while stabilising pipeline flow. The compact angle design allows direct installation at 90° pipe bends, eliminating additional elbows and reducing installation space. Available with JIS10K flanges from DN50 to DN200, the ALF-S Series is ideally suited to industrial process water, food production, coastal installations and higher pressure water systems.
Valve function & operation
Function: L-pattern anti water hammer surge arrestor
Hydraulic shock absorber
Operating principle: Pre-charged diaphragm air cushion with flow-directing impeller
Absorbs hydraulic shock and stabilises flow
Suitable for horizontal or vertical installation
Flange sizes: DN50, DN65, DN80, DN100, DN150 and DN200
Standard flange: JIS10K
Optional flange standards:
PN10
PN16
JIS20K
ANSI 150 lb
Pressure & performance
Working pressure: 0 to 20 Bar
Pressure tested: 35 Bar
Pre-charge pressure: 2.5 Bar
Adjustable via Schrader valve
Air chamber volume: 1,490 cc to 27,230 cc
(According to valve size)
Pressure gauge: Included
Maximum media temperature: +80°C
Minimum media temperature: -15°C
Maximum media viscosity: 50 cSt
Mounting position: Any position
Construction & materials
Body: 304 stainless steel
Air chamber: Pre-charged diaphragm type
Diaphragm: NBR
Standard seals: NBR
Optional diaphragm: FKM (Viton)
Schrader charging valve included
Media compatibility
✓ Water
✓ Process water
✓ Cooling water
✓ Food processing water
✓ Irrigation systems
✓ Water-based fluids compatible with the valve materials
Performance & design
✓ Patented L-pattern surge arrestor design
✓ Patented flow-directing impeller stabilises flow while reducing hydraulic shock
✓ Pre-charged diaphragm air cushion rapidly absorbs pressure surges
✓ Compact 90° configuration eliminates additional elbows and reduces installation space
✓ Pressure gauge allows quick monitoring of air chamber pressure
✓ No sliding mechanical components for reliable, low-maintenance operation
✓ Suitable for higher pressure systems up to 20 Bar
✓ Suitable for horizontal or vertical installation
✓ Protected by Patent No. 140580
Installation recommendations
For optimum protection, install the ALF-S at the first pipe bend immediately downstream of fast-closing valves or pumps.
For pipe runs exceeding 50 metres or systems operating above 5 Bar, a second surge arrestor is recommended at the first bend following the longest straight pipe section.
Maintain a minimum clearance of 100 mm from adjacent walls to allow future servicing and pressure adjustment. Air chamber pressure should normally be maintained between 60% and 90% of the operating pipeline pressure. Where the outlet discharges to atmosphere, such as into a storage tank, a pre-charge pressure of approximately 1.0 to 1.3 Bar is recommended.
Where water hammer occurs
Water hammer commonly develops:
✓ Downstream of check (non-return) valves
✓ At pipeline direction changes
✓ Long horizontal pipe runs exceeding 50 metres
✓ Pump start-up and emergency shutdown
✓ Fast-closing valves and automated control systems
Applications
Food and beverage manufacturing
Industrial process water
Pump stations
Cooling water systems
Chemical processing
Irrigation systems
Coastal installations
High-pressure water systems
Water treatment plants
General industrial water distribution
Manufacturing quality
Manufactured using a heavy-duty 304 stainless steel body with a pre-charged diaphragm air chamber and patented flow-directing impeller, the Z-Tide Industrial ALF-S Series has been engineered for demanding industrial environments where corrosion resistance, high-pressure capability and long-term reliability are essential. Unlike conventional inline surge arrestors, the L-pattern configuration combines pressure absorption with controlled flow redirection, allowing installation directly at pipeline corners where hydraulic shock is often most severe. The pre-charged diaphragm separates the air cushion from the water supply to maintain consistent long-term performance, while the integrated pressure gauge and Schrader valve allow quick inspection and adjustment of the air chamber. Designed for working pressures up to 20 Bar, the ALF-S Series provides dependable protection for pumps, valves and pipework operating in corrosive and high-pressure water systems. Protected by Patent No. 140580.
Ordering information
Simply select the required flange size and flange standard before adding the surge arrestor to your basket. Optional PN10, PN16, ANSI 150 lb and JIS20K flanges together with FKM diaphragms are available to suit your application.
Port Size:
4 inch Flange DN100 , 5 inch Flange DN125 , 6 inch Flange DN150 , 8 inch Flange DN200 , 2 inch Flange DN50, 21/2 inch Flange DN65 , 3 inch Flange DN80
Pressure:
3 Bar, 3.5 Bar, 4 Bar, 4.5 Bar, 5 Bar, 5.5 Bar, 6 Bar, 6.5 Bar, 7 Bar, 7.5 Bar, 8 Bar, 8.5 Bar, 9 Bar, 10 Bar, 12 Bar, 13 Bar, 14 Bar, 15 Bar, 16 Bar, 17 Bar, 18 Bar, 20 Bar
Seals:
NBR
Media:
Fluid (Non Aggressive), Fluid (Slight Acid/Alkali), Water, Water (RO/Pure/Demin)
