Yoshitake SCV-3 User manual

■EPDT-284c■
MODEL SCV-3
CHECK VALVE
PRODUCT MANUAL .
Thank you very much for choosing the Yoshitake’s product. To ensure the correct and safe use of the
product, please read this manual before use. This manual shall be kept with care for future references.
The symbols used in this manual have the following meanings.
Warning
This symbol indicates a potentially hazardous situation that, if not avoided,
could result in death or serious injury.
Caution
This symbol indicates a hazardous situation that, if not avoided, may result in
minor or moderate injury or may result in only property damage.
Table of Contents
Usage of the Product······················································1
1. Features···································································1
2. Specifications····························································1
3. Structure, Dimensions and Weights ···························· 1-2
4. Pressure loss ···························································2
5. Installation ·······························································3
5.1 Precaution for installation ······································· 3
6. Operating procedure···················································3
6.1 Precaution for operating procedure ·························· 3
7. Maintenance ·····························································4
7.1 Troubleshooting···················································4
7.2 Precaution for maintenance···································· 4
8. Connectable flange standard table································· 4
9. Bundled parts ····························································5
Warranty Information

‐1‐ ■ EPDT-284c■
Usage of the Product
The SCV-3 check valve is to prevent backflow of fluid. It is widely used in steam pipelines or cold and hot water
pipelines.
1. Features
1. Flangeless wafer type applicable for various flange standards.
2. Can be connected in any posture (horizontal or vertical).
2. Specifications
Model SCV-3
Nominal size 15A-100A
Application Steam, Cold and hot water
Maximum pressure 2.0 MPa
Applicable temperature 5-220 ℃
Installation posture Installable in any orientation
Connection Flangeless (wafer type)
See “8. Connectable flange standard table” on Page 4
Minimum valve opening
pressure 0.003 MPa
Body SCS14A
Disc SCS14A
* The product cannot be disassembled.
* Since a small amount of fluid leaks out of the product, it cannot be used for applications requiring
complete closing.
Caution
Please confirm that the indications on the product correspond with the specifications
of the ordered product model before use.
* If they are different, do not use the product and contact us.
3. Structure, Dimensions and Weights
No. Part name
1 Body
2 Disc
3 Spring
4 Spring Plate

‐2‐ ■ EPDT-284c■
(mm)
Nominal
size φd φd1L φD φD1A Weight (kg)
15A 15 35 16 43 28 63 0.2
20A 20 45 19.5 53 35 69.5 0.3
25A 25 51 22 63 41.5 80.5 0.4
32A 32 60.5 28 72.5 49.5 90.5 0.7
40A 40 70 31.5 82 57.5 101 0.9
50A 50 90 40 95.5 76 115 1.5
65A 65 102 45 116 87 142 2.2
80A 80 121 50 129.5 105.5 153.5 2.9
100A 100 145 60 154.5 128 180 4.5
Fig.1 Structure, dimensions and weights
4. Pressure loss
Fluid: water
.
Fig. 2 Pressure loss chart
V: Flow rate [L/min]
ΔP: Pressure loss [MPa]

‐3‐ ■ EPDT-284c■
5. Installation
5.1 Precaution for installation
Caution
1. Before connecting the product in the piping, be sure to remove foreign substances and scale from the
piping.
* Failure to follow this notice causes valve seat leakage due to the ingress of foreign substances and
scale into the product.
2. To install the product, check the direction of the product so that the fluid flowing and the arrow marked on
the product are in the same direction.
* Wrong direction prevents fluid from flowing.
3. Connect the product to the piping so that excessive load, torque or vibration cannot be applied to the
product. Be sure to connect the product to piping firmly.
* Failure to follow this notice may cause fluid leakage and result in burns or property damage.
4. On installation, align center part of the product with that of flange by making fin-shaped part contact with
bolt as indicated in the figure below.
6. Operating procedure
6.1 Precaution for operating procedure
Caution
Before leading fluid, make sure that there is no danger when the fluid flows to the end of piping.
* If tightening is not secured, hot fluid may spout out and result in burns.
* Fluid outflow may cause property damage.
Fin-shaped part
(Body of the product)
Bolt Flange
SCV-3
*The flange is not included in the bundled parts.

‐4‐ ■ EPDT-284c■
7. Maintenance
7.1 Troubleshooting
Trouble Cause Remedy
Fluid does not flow.
1.
Contact surface of b
ody [1] and
disc [2] is stuck.
1.
Replace the product if disc [2] does not
move.
2.
Installation direction is wrong.
2.
C
onfirm the arrow on the product and
install it correctly.
Fluid flows back.
1.
Cont
act surface of body [1] and
disc [2] is worn away.
1.
Replace t
he product.
2.
Internal parts are damaged.
2.
Replace the product.
7.2 Precaution for maintenance
Warning
Completely discharge the internal pressure from the valves, lines and equipment, and cool the valve down
to a level where you can touch it with bare hands before disassembly and inspection.
* Failure to do so may result in injury or burns due to residual pressure or spillage around the valve.
8. Connectable flange standard table
SCV-3
Nominal
size
JIS ASME・JPI PN(EN/DIN)
5K 10K* 16K 20K 125lb 150lb 250lb 300lb 6 10 16 25 40
15A ○○○○× ○× ○○○○○○
20A ○○○○× ○× ○○○○○○
25A ○○○○○○○○○○○○○
32A ○○○○○○○○○○○○○
40A × ○○○○○○○○○○○○
50A × ○○○○○○○○○○○○
65A ○○○○○○○○○○○○○
80A × ○○○○○○○○○○○○
100A × ○○○○○○○× ○○○○
”○” in the above table means connectable flange to the product. “×” means not connectable.
* Bundled bolts and nuts are for JIS 10K flange only.

‐5‐ ■ EPDT-284c■
9. Bundled parts
The bolts, nuts and gaskets used for SCV-3, have shipped with the product as a bundled part as follows.
Please check the included contents. Refer to Table 1 below for dimensions and quantities.
SCV-3
Nominal
size
Inlet side gasket Outlet side gasket
gasket
material
Nominal
bolt
dimension
×length
Qty
Outer
diameter
Inner
diameter
Thickness
Qty
Outer
diameter Inner diameter
Thickness
Qty
15A
φ 58
φ 22
1.5 1
φ 58
φ 28
1.5 1
Non Asbestos
M12×70 4
20A
φ 63
φ 28
φ 63
φ 35 M12×75 4
25A
φ 74
φ 35
φ 74
φ 42 M16×80 4
32A
φ 84
φ 43
φ 84
φ 50 M16×90 4
40A
φ 89
φ 49
φ 89
φ 58 M16×95 4
50A
φ 104
φ 61
φ 104
φ 77 M16×100
4
65A
φ 124
φ 84
φ 124
φ 88 M16×110
4
80A
φ 134
φ 90
φ 134
φ 106 M16×120
8
100A
φ 159
φ 115
φ 159
φ 129 M16×130
8
*The bundled bolts and nuts are not made of stainless steel.
*The inlet gasket is equivalent to JIS B2404 Table4 10K dimensions.
*The flange is not included in the bundled parts.
Caution
1. As shown in Table 1, the Inlet diameters of the gasket differ between the inlet side and the outlet side.
Refer to Table 1 to avoid piping mistakes.
* Failure to follow this notice causes external leakage.
2. Please be sure to use the bundled gasket when installing the piping. Gasket can be used up to 2.0 MPa.
3. Bundled bolts and nuts are for JIS 10K flange only. Please prepare the bolts and nuts for other than
JIS 10K flange by user themselves.
×
4 sets
Or
8 sets
Inlet side gasket Outlet side gasket
Inlet and outlet gasket
(Inlet diameters are different at
inlet and outlet)
Bolt and nuts for JIS 10K flanged
Table 1 Dimensions and Quantities of Bolts, Nuts and Gaskets
Inlet side gasket
Outlet side gasket