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SL-SN-B
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SL-SH-B
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SL-SNP-B
Swing type (Bore 150-450mm)
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SL-SHP-B
Swing type (Bore 500-1000mm)
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 P denotes that the check valve is equipped with a
No-Feed Detector. |
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A compact dashpot has been built into the YOKOTA Non-Water Hammer Check
Valve.
Dashpot Type Check Valve (Buffered closing by-pass valve)
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Ideal design
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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.
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Easy maintenance
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The dashpot is attached at the side of the valve case so adjustment and
maintenance are easy to perform.
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Easy oil control
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The dashpot is small and separate from the passage of the main valve. Therefore
oil leaks do not occur and oiling is practically unnecessary.
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Freely choose between vertical or horizontal installation
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This valve can be installed in either vertical or horizontal piping.
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Simple construction
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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.
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Part name
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Buffered by-pass valve
material code
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G
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N
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X, Y
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1
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Valve case
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FC
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FCD
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SCS
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2
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Valve cover
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FC
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FCD
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SCS
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3
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Valve disk
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SCS
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SCS
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SCS
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4
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Valve rod
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SUS
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SUS
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SUS
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5
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Valve seat
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SUS
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SUS
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SUS
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6
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Maintenance
by-pass valve
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SUS
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SUS
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SUS
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7
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Dashpot
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S45C
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S45C
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S45C
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Bore
d
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Model No.
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Width WN
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150
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SL-SN-1150B
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1360
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200
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SL-SN-1200B
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1430
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250
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SL-SN-1250B
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1580
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300
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SL-SN-1300B
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1620
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350
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SL-SN-1350B
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1740
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400
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SL-SN-1400B
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1860
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450
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SL-SN-1450B
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1900
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500
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SL-SH-1500B
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1870
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600
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SL-SH-1600B
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1980
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700
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SL-SH-1700B
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1150
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800
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SL-SH-1800B
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1300
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900
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SL-SH-1900B
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1450
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1000
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SL-SH-1000B
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1550
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Buffered closing by-pass valve type is applicable when actual head is over
10m.
Please inquire if actual head is less than 10m.
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Please specify the level of reverse pressure on the valve and the by-pass
valve closure time when making an inquiry.
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As for material code and dimensions of the main valve, please refer to
SL-SN type and SL-SH type.
Selection chart
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If it is necessary to prevent water hammer due to recombined flow after
water column separation in the middle of piping, please contact us.
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Specifications stated here may be subject to change without notice due
to product improvement.
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