Non-Water Hammer Check Valve


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

No valve closure delay means no water hammer and no noise

Top page
& Site map
Contact us


SL-SN-D

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


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


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

Quiet with no water hammer

There is no delay in the start of valve closure because the valve disk opens and closes in response to the amount of flow. 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.

New dashpot

Based on non-water hammer principle, a unique patented mechanism has been adopted in which the valve disk is connected to the dashpot and buffered closing occurs at a point immediately before valve closure when the flow within the pipe nears a standstill. As a result, the dashpot has been made compact, inexpensive, and operation is reliable.

Built-in counterweight

Since the valve arm and the valve disk form the counterweight and the valve seat is designed at an angle to the passage of flow, operation within the range in which the valve disk closes rapidly is smooth and quick.

Buffered closing begins softly

At the point when operation changes from rapid closing to buffered closing, a load begins to bear gradually on the connection pin when the speed of flow nears zero, activating braking by the dashpot. Thus there is no shock to each link and the valve begins to be buffered smoothly.

Easy handling

Dashpot buffered closing timing adjustment and maintenance inspections are extremely simple, and maintenance costs can be reduced considerably because of the simple, single-disk construction.



Non-Water Hammer Check Valve Principle of SL-SND


Example of sewage (treatment) plant drainage facility

Non-Water Hammer Check Valve Example of sewage (treatment) plant drainage facility

Non-Water Hammer Check Valve Comparison of pressure


Non-Water Hammer Check Valve SL-SND Sectional Assembly

Unit: mm

Part name
Buffer unit material code
G, N
X, Y
50

Connecting rod

SUS
SUS
51

Connecting arm

SUS
SUS
52

Connecting pin

SUS
SUS
53

Lock nut

SUS
SUS
54

Stopper

SUS
SUS
55

Packing cover

FC200
SUS
56

Bearing

Submerged
bearing
Submerged
bearing
57

Packing holder

C3603
SUS
58

U packing

NBR
NBR
59

Dashpot

S45C
S45C
60

Support pivot

SUS
SUS
61

Lever

SUS
SUS
62

Support

SUS
SUS


Unit: mm

Bore
d
Model No.
Height R
150
SL-SN-150D
450
200
SL-SN-200D
500
250
SL-SN-250D
540
300
SL-SN-300D
700
350
SL-SN-350D
750
400
SL-SN-400D
950
450
SL-SN-450D
950


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


© Yokota Manufacturing Co., Ltd. Tel: +81 82-241-8672 E-mail: yokota@aquadevice.com Terms of Use