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Wafer-Type Check Valve

Wafer-Type Check Valve
SL-SW type
(PAT.), SL-SF type

Simple construction allows for high performance and low price

SL-SW type Patented in Japan
Wafer-Type Check Valve / SL-SW type Patented in Japan
SL-SF type
Wafer-Type Check Valve / SL-SF type

Bore

40-300mm

Rated pressure

1MPa

Bore

350-500mm

Rated pressure

1MPa

>Selection & Dimensions

SL-SW type:

Small Bore Wafer-Type Check Valve

SL-SF type:

Medium Bore Wafer-Type Check Valve (For vertical installation)


Simple construction, Low price

Available at low prices due to the simple, single-disk construction.

Applicable to any kind of liquid

The valve can be applied for use with various kinds of liquid ranging from pure water to seawater, contaminated water and chemical liquid as it can be made from YOKOTA's duplex type stainless steel YST130N (see note below).

Reduction of water hammer (SL-SW type)

A helical torsion spring is attached to the valve arm pin which allows adjustment of the spring force necessary for valve closure. This patented mechanism eliminates the valve closure delay and reduces water hammer. (Except material code T)



Example applications

Wafer-Type Check Valve

Wafer-Type Check Valve


 Note: Advantages of YOKOTA's duplex type stainless steel YST130N.

Excellent crevice and pitting corrosion resistance in marine environments.

Excellent corrosion resistance to chemicals such as sulfuric acid, hydrochloric acid, and nitric acid.

Remarkable mechanical strength, being nearly twice as strong as general JIS materials.


For details of YST130N, please refer to this page.


Selection chart & Outer dimensions (SL-SW type, SL-SF type)

SL-SW type

Wafer-Type Check Valve / SL-SW type
Unit: mm
Part name
Material code (JIS 10K standard)
G
X
T
1

Valve case

FC250
SCS13
YST130N
2

Valve disk

SCS13
SCS13
YST130N
3

Valve seat

SUS304
-
-
4

Seal ring

NBR
NBR
EPDM
5

Arm pin

SUS304
SUS304
YST130N
6

Coil spring

SUS304
SUS304
-
7

Coil lock pin

SUS304
SUS304
-
8

Set pin

SUS304
SUS304
-
9

Spacer

PTFE
PTFE
PTFE
10

Plug

SUS304
SUS304
YST130N
11

Plug

SUS304
SUS304
-
12

Eyebolt

SS400
SS400
SS400
40

Pipe attaching bolt and nut

(SS400)
(SS400)
(SS400)
41

By-pass valve

(SCS13)
(SCS13)
-
42

By-pass valve seat

SUS304
-
-
Bore
d
JIS 10K standard
Bolt and nut
Weight
(kg)
d1
D
L
P
H
l
n-M

40

55

86

58

14

115

145

4-M16

2

50

67

102

60

19

125

145

4-M16

2

65

75

121

65

25

130

155

4-M16

4

80

90

132

70

32

135

160

8-M16

5

100

116

157

75

43

145

170

8-M16

6

125

143

188

85

55

190

190

8-M20

7

150

165

218

100

65

215

205

8-M20

9

200

214

267

110

90

240

215

12-M20

15

250

265

330

135

120

260

255

12-M22

22

300

315

375

150

155

280

275

16-M22

31

 Note:

Material code T is only for installation in vertical piping.

The by-pass valve and pipe attaching bolts and nuts are optional parts.

P shows the approximate dimension of valve disk overhang when the valve is fully open.

Valves with a bore of 40mm are made of stainless steel castings.

The structure for valves with a bore of 40-80mm is slightly different from the one shown above.

The eyebolts are not attached to valves with a bore of 100mm or less.

The seal ring is subject to change depending on the liquid property.

The dimensions of the pipe attaching bolts and nuts shown apply to a JIS 10K standard steel flange.

Please use JIS 10K standard flanges for connection. JIS 5K or waterworks standard flanges cannot be connected.

Please contact us if flange standard is higher than JIS 16K.

Materials other than standard materials are available. Please inquire.


SL-SW type characteristics (Water head loss - Flow rate)

Wafer-Type Check Valve / Characteristics (Water head loss - Flow rate) SL-SW


SL-SW type installation notes

Material code T is only for installation in vertical piping.

Make sure that no other adjacent valve or machine contacts the valve disk taking into account the valve disk overhang dimension P.

Install with the eyebolt at the top for installation in horizontal piping.

The eyebolts are not attached to valves with a bore of 100mm or less. Before starting installation, insert 2 bolts at the bottom and then install the valve with the arm pin bearing at the top.



SL-SF type

Wafer-Type Check Valve / SL-SF type

Unit: mm

Part name
Material code (JIS 10K standard)
X
Y
T
1

Valve case

SCS13
SCS14
YST130N
2

Valve disk

SCS13
SCS14
YST130N
3

Valve arm

SCS13
SCS14
YST130N
4

Valve spindle

SUS304
SUS316
YST130N
5

Lock nut

SUS304
SUS316
YST130N
6

Arm pin

SUS304
SUS316
YST130N
7

Pin holder

SUS304
SUS316
YST130N
8

Seal ring

NBR
NBR
EPDM
9

O-ring

NBR
NBR
EPDM
10

Stopper

NBR
NBR
EPDM
11

Eyebolt

SS400
SS400
SS400
40

Attaching bolt and nut

(SS400)
(SS400)
(SS400)

Unit: mm

Bore
d
JIS 10K standard
Bolt and nut
Weight
(kg)
d1
D
L
P
l
n-M

350

350

420

260

75

385

16-M22

100

400

400

483

300

80

435

16-M24

145

450

450

538

340

85

480

20-M24

180

500

500

593

365

100

510

20-M24

280

 Note:

The by-pass valve and pipe attaching bolts and nuts are optional parts.

P shows the approximate dimension of valve disk overhang when the valve is fully open.

The seal ring is subject to change depending on liquid property.

The dimensions of the pipe attaching bolts shown apply to a JIS 10K standard steel flange.

Please use JIS 10K standard flanges for connection. JIS 5K or waterworks standard flanges cannot be connected.

Materials other than standard materials are available. Please inquire.


SL-SF type characteristics (Water head loss - Flow rate)

Wafer-Type Check Valve / Characteristics (Water head loss - Flow rate) SL-SF


SL-SF type installation notes

This check valve is only for installation in vertical piping.

Make sure that no other adjacent valve or machine contacts the valve disk taking into account the valve disk overhang dimension P.



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

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