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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SL-SN-B

SL-SH-B

SL-SNP-B
Swing type (Bore 150-450mm)

SL-SHP-B
Swing type (Bore 500-1500mm)

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

If a valve with a bore greater than 1500mm is required, please contact us.



A compact dashpot has been built into the YOKOTA Non-Water Hammer Check Valve.
Dashpot Type Check Valve (Buffered closing by-pass valve)

Ideal design

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.

Easy maintenance

The dashpot is attached at the side of the valve case so adjustment and maintenance are easy to perform.

Easy oil control

The dashpot is small and separate from the passage of the main valve. Therefore oil leaks do not occur and oiling is practically unnecessary.

Freely choose between vertical or horizontal installation

This valve can be installed in either vertical or horizontal piping.

Simple construction

The main valve features an extremely simple, single-disk construction (with a built-in counterweight). Moreover, the valve arm pin of the main valve does not bear torsional load due to the non-water hammer principle, allowing for a compact design and cost reduction.



Non-Water Hammer Check Valve SL-SH-B

Non-Water Hammer Check Valve Example of operation


SL-SN-B, SL-SNP-B type

Non-Water Hammer Check Valve SL-SN-B

SL-SH-B, SL-SHP-B type

Non-Water Hammer Check Valve SL-SH-B

Unit: mm

Part name
Buffered by-pass valve
material code
G
N
X, Y
1

Valve case

FC
FCD
SCS
2

Valve cover

FC
FCD
SCS
3

Valve disk

SCS
SCS
SCS
4

Valve rod

SUS
SUS
SUS
5

Valve seat

SUS
SUS
SUS
6

Maintenance by-pass valve

SUS
SUS
SUS
7

Dashpot

S45C
S45C
S45C

Unit: mm

Bore
d
Model No.
Width WN

150

SL-SN-150B
360

200

SL-SN-200B
430

250

SL-SN-250B
580

300

SL-SN-300B
620

350

SL-SN-350B
740

400

SL-SN-400B
860

450

SL-SN-450B
900

Unit: mm

Bore
d
Model No.
Width WH

500

SL-SH-1500B
1870

600

SL-SH-1600B
1980

700

SL-SH-1700B
1150

800

SL-SH-1800B
1300

900

SL-SH-1900B
1450

1000

SL-SH-1000B
1550

1200

SL-SH-1200B
1800

1350

SL-SH-1350B
1950

1500

SL-SH-1500B
2200

Buffered closing by-pass valve type is applicable when actual head is over 10m.
Please inquire if actual head is less than 10m.

Please specify the level of reverse pressure on the valve and the by-pass valve closure time when making an inquiry.


As for material code and dimensions of the main valve, please refer to SL-SN type and SL-SH type.


Selection chart
YOKOTA Non-Water Hammer Check Valve Selection chart

If it is necessary to prevent water hammer due to recombined flow after water column separation in the middle of piping, please contact us.


Specifications stated here may be subject to change without notice due to product improvement.

Features
Structure
Technical data
Selection & Dimensions
Inquiry form


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