Non-Slam Nozzle Check Valves
SIERRA Model 5500 non-slam nozzle check valve is one of the fast-closing check valves that reduce slam and water hammer due to its short linear stroke, low moving masses supported by helical springs that ensure valves closing slam-free within fractions of seconds. The nozzle check valve design also reduces head loss during operation. Hence is one of the most economical valves.
Design Features
Non-Slam: Quick Response: Low weight discs, short stroke lengths and spring assistance combine to ensure that the Axial type of check valve responds quickest to change in flow direction. This fast response ensures reverse velocity cannot build up to a level that can damage pumps, pipes or related equipment.
Minimal Headloss: The valve design and nozzle shape maintain streamlined flow passage, optimum flow, optimized zeta values, and extremely low head-loss coefficient in open position. The valve body and diffuser design create a venturi shape to create a pressure differential across the disc to assist in opening the valve and ensuring a high-pressure recovery resulting in a low pressure drop across the valve.
Drop Tight Seating: Resilient-seated discs assure positive seating at high- and low-pressure ratings
Maintenance Free: Sierra non-slam nozzle check valves design and material selection of inner parts, minimizes wearing of parts, it is considered maintenance free valve. The springs are sized according to the flow rates to ensure that the valves are in the fully open position during normal use.
Non-Slam Nozzle Check Valve Advantages
- Closing time (dynamic response) is a fraction of a second
- In case of sudden pump stops, nozzle check valve reduces pressure surges in the pipeline
- Avoid pressure surges in the pipeline or minimizes them
- Suitable for high pressure applications
- Non-slam (Silent) check valve
- Face to face, according to ISO5752 series 14 enabling easy installation
- No maintenance required
- Suitable for vertical, horizontal and diagonal mounting
- Low pressure drops
- Perfect disc sealing which provides tight shutoff
- Low maintenance cost
Material Standards
1,2. Body, Diffuser ——- Ductile Iron EN-GJS-500/7 Or Ductile Iron EN-GJS-400/12 Acc. To (EN1563)
3. Disc ——- Ductile Iron (EN-GJS-500/7) rubber vulcanized disc
4. Spring ——- Stainless steel Grade 316
5. Bearing ——- Bronze