Non-Water Hammer Check Valve


Non-Water Hammer Check Valve
SL series
(PAT.)

No valve closure delay means no water hammer and no noise

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Selection chart & Outer dimensions

By clicking the name of the product type or its picture, a related specifications and outer dimensions table will appear.

SL series lineup

Use conditions

Type

Secondary actual head: More than 10m

and

Reverse flow: Acceptable

SL-SN-B
SL-SNP-B
SL-SH-B
SL-SHP-B

Swing type
Dashpot Type Check Valve
(Buffered closing by-pass valve)

P denotes that the check valve is equipped with a No-Feed Detector.

Non-Water Hammer Check Valve / DashPot Type Check Valve

Based on non-water hammer principle, closure delay of the main valve disk is eliminated and water hammer and shock do not occur. Also, the patented mechanism, including the buffered closing by-pass valve, prevents pressure increase after main valve disk closure. Therefore, the valve is an ideal device that can be used extensively in low to high head specifications.

Bore 150-1500mm

Secondary actual head: More than 10m

and

Reverse flow: Unacceptable


or

Secondary actual head: Under 10m

and

Pipe length: More than 10m

SL-UC
Lift type
For ultra-pure water

Non-Water Hammer Check Valve / Lift type For ultra pure water

The smoothness of the water-contacting surface is achieved by machining all of the metal parts from stainless steel billets. After electrolysis polishing to the same level as applied to UV oxidization devices, we remove all grease and apply a special grease-proof treatment we have perfected over many years. Additionally, the valve can be completely sealed after being washed with pure water and purged with nitrogen gas upon request.

Bore 40-150mm

SL-NU
Lift type

Non-Water Hammer Check Valve / Lift type

This valve is easy to install, highly reliable and safe, and therefore quite suitable to automatic pumping systems.
We also manufacture grease-proof treated products using stainless steel material for pure water lines, and have provided an even cleaner electrolysis-polished Non-Water Hammer Check Valve (SL-UC ) for ultra-pure water lines.

Bore 40-300mm

SL-NB
SL-NBP
Lift-bend typ
e

P denotes that the check valve is equipped with a No-Feed Detector.

Non-Water Hammer Check Valve / Lift-bend type

Because of its excellent characteristics and convenient design, highly reliable automatic pumping can be easily accomplished.

Bore 40-300mm

SL-SN
SL-SNP

S
wing type

P denotes that the check valve is equipped with a No-Feed Detector.

Non-Water Hammer Check Valve / Swing type

This swing type check valve with a built-in counterweight is designed taking into account the inertial moment of the center of gravity of the valve disk. The valve seat is uniquely sloped and the case configuration in front of, and behind the valve seat is designed to facilitate immediate valve closure. Inspection of the interior can be performed easily by removing the valve cover.

Bore 50-450mm

SL-SH
SL-SHP

Swing type

P denotes that the check valve is equipped with a No-Feed Detector.

Non-Water Hammer Check Valve / Swing type

Even the large valves feature simple, single-disk construction (with a built-in counterweight), so highly reliable automatic pumping can be easily accomplished.

Bore 500-1500mm

Secondary actual head: Under 10m

and

Pipe length: Under 10m

SL-SN-D
SL-SNP-D

Swing type
Dashpot Type Check Valve
(Buffered closing main valve)

P denotes that the check valve is equipped with a No-Feed Detector.

Non-Water Hammer Check Valve / Dashpot type Check Valve

By making full use of the Non-Water Hammer Check Valve features, which prevents water hammer, and by adding the function of the dashpot, shock is completely absorbed even in short pipes with low head.

Bore 150-450mm



No-Feed Detector

Non-Water Hammer Check Valve / No-Feed Detector

The YOKOTA No-Feed Detector is a safety device to prevent the pump from dry operation. Reacting to the movement of the check valve, the switch cuts off power automatically when the amount of flow is close to zero.



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Technical data
Selection & Dimensions
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