Yoshitake SCV-3 Manuale utente

■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.

Contact surface of b

ody [1] and

disc [2] is stuck.

Replace the product if disc [2] does not

move.

Installation direction is wrong.

onfirm the arrow on the product and

install it correctly.

Fluid flows back.

Cont

act surface of body [1] and

disc [2] is worn away.

Replace t

he product.

Internal parts are damaged.

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)

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

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

65A

φ 124

φ 84

φ 124

φ 88 M16×110

80A

φ 134

φ 90

φ 134

φ 106 M16×120

100A

φ 159

φ 115

φ 159

φ 129 M16×130

*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

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

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