Yoshitake AL-27 Bedienungsanleitung

■EPDT-351■

MODEL AL-27

SAFETY RELIEF 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

1. Usage of the Product·················································· 1

2. Specifications···························································· 1

3. Dimensions and Weight ·············································· 2

4. Structure ································································ 3

5. Operation ······························································· 3

6. Nominal Size Selection Chart ······································· 4

7. Installation···························································· 7-12

7.1 Fitting pipe base ·················································· 8

7.2 Discharge pipe ···················································· 8

7.3 Set pressure adjustment···································· 9-12

8. Maintenance····························································12

8.1 Daily inspection ··················································12

8.2 Periodic inspection··············································12

8.3 Troubleshooting············································· 13-14

Warranty Information

■EPDT-351■

Usage of the Product

The AL-27 is a relief valve for pressure control in a pump system in which large pressure pulsation or

fluctuation occurs.

. Specifications

Model AL-27

Structure Closed type

Application Cold and hot water, Oil (heavy oil A, heavy oil B, kerosene),

other non-dangerous fluids (20 cSt or less)

Working pressure 0.05 - 1.6 MPa

Max. temperature 120°C

Connection JIS Rc screwed

Nominal size 15-50A

Material Spring case Ductile cast iron

Valve, valve seat Stainless steel

Warning

1. Do not apply the product to equipment or devices which do not allow any valve seat leakage.

* The product has allowable valve seat leakage and does not close completely (valve seat leakage

cannot be zero).

2. Do not use the product for equipment or device which vibrates excessively.

* Failure to follow this notice may result in malfunction.

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.

■EPDT-351■

. Dimensions and Weight

Figure 1. Dimensions

Table 1. Dimensions and weight

(mm)

Nominal

Size d L H1H

Weight(kg)

15A

Rc 1/2 40 40 143 0.9

20A

Rc 3/4 45 50 162 1.3

25A

Rc 1 50 60 182 1.7

32A

Rc 1 1/4 60 70 220 2.9

40A

Rc 1 1/2 65 75 238 3.9

50A

Rc 2 80 85 272 6.4

■EPDT-351■

. Structure

Figure 2. Structure

Table 2. Parts list

Spring plate

Spring 13

Gasket

Spindle 12

Gasket

Valve 11

Cap

Valve seat 10

Lock nut

Body 9

Adjusting screw

Spring case 8

Spring plate

№

Part name №

Part name

. Operation

As the inlet pressure approaches the set pressure, the force of fluid pushing up the valve [4] approaches the

force of the spring [6] pressing down the valve [4]. When the inlet pressure increases further, the valve [4]

opens and discharges the fluid. The valve lift changes responding to the inlet pressure and controls it.

(See Figure 2.)

Outlet

Inlet

■EPDT-351■

. Nominal Size Selection

Chart

The flow rate of each size with 25% of accumulation (excess to the set pressure) is shown in Figure 3.

See Figure 4 when the accumulation is less than 25%.

Fluid: Water

Figure 3. Nominal size selection chart

Example:

When selecting the nominal size for opening pressure of 0.3 MPa and discharge capacity of

1.0 m3/h, find the intersection point (a) of the opening pressure of 0.3 MPa and the discharge

capacity of 1.0 m3/h. The intersection point (a) lies between the nominal sizes 15A and 20A,

select the larger one, 20A.

Opening pressure MPa

Discharge capacity m 3/h

Nominal size

(a)

■EPDT-351■

Figure 4. Approximate flow rate magnification

Figure 4 is referred to when calculating the approximate flow rate with accumulation less than 25%.

Example:

When calculating the flow rate of the size of 25A, with the opening pressure of 0.1 MPa, and

accumuation of 20%, first, find the flow rate with the accumulation of 25% by using Figure 3.

Next, find the intersection (b) with the accumulation of 20% by Figure 4 and read the value of

the approx. flow rate magnification, that is 0.8.

Multiple the opening pressure found in Figure 3 by the approximate flow rate magnification

found in Figure 4.

1.08(m3/h)×0.8(magnification)≒0.86(m3/h)

Thus, the flow rate with the accumulation of 20% is approximately 0.86 m3/h.

Table 3 shows discharge capacities at certain pressures for reference.

(b)

Accumulation %

Approx. flow rate magnification

■EPDT-351■

Table 3. Discharge capacity (for Reference)

[Accumulation: 25%]

(m3/h)

Nominal

size

Set pressure (MPa)

0.05

0.1

0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

15A 0.30

0.42

0.6 0.74

0.85

0.95

1.04

1.13

1.21

1.28

1.35

20A 0.49

0.69

0.98

1.20

1.39

1.55

1.70

1.84

1.96

2.08

2.20

25A 0.77

1.08

1.54

1.88

2.17

2.43

2.66

2.88

3.08

3.26

3.44

32A 1.26

1.78

2.52

3.09

3.57

3.99

4.37

4.72

5.04

5.35

5.64

40A 1.98

2.80

3.96

4.85

5.60

6.26

6.86

7.41

7.92

8.40

8.86

50A 3.09

4.37

6.18

7.57

8.74

9.77

10.71

11.57

12.37

13.12

13.83

(m3/h)

Nominal

size

Set pressure (MPa)

1.1

1.2

1.3 1.4 1.5 1.6

15A 1.42

1.48

1.54

1.6 1.65

1.71

20A 2.30

2.41

2.51

2.60

2.69

2.78

25A 3.61

3.77

3.92

4.07

4.21

4.35

32A 5.92

6.18

6.43

6.67

6.91

7.14

40A 9.29

9.70

10.10

10.48

10.85

11.21

50A 14.50

15.15

15.76

16.36

16.93

17.49

■EPDT-351■

. Installation

Warning

1. Do not install any closing devices such as a stop valve at inlet or outlet side of the product.

2. Do not apply the product to equipment or devices which do not allow any valve seat leakage.

3. Install an exhaust pipe on outlet side of the product, and lead it to a place where there is no risk of

physical damage even if fluid blows out.

* Failure to follow this notice may result in injury and scalds in case of fluid blow out.

4. Do not disassemble the product.

* Failure to follow this notice may prevent the product from functioning properly and lead to danger.

5. Securely connect the product with the piping

* Failure to follow this notice may cause fluid leakage from the connections due to vibration resulting in

injury and scalds.

6. When installing, tighten the hexagonal part of the body with a spanner.

7. Do no apply viscous fluid that may make the valve and valve seat stuck together.

* Failure to follow this notice may cause malfunction due to sticking together of the valve and valve seat.

8. When connecting a pipe to the product outlet, do not adjust the direction of the product by applying force

to the pipe.

* Failure to follow this notice may cause blowout due to damage on the thread or loose connection.

Caution

1. When installing the product, match the direction of fluid flow with the inlet and outlet of the product

respectively.

* Failure to follow this notice prevents the product from functioning properly and discharging the

pressure from the outlet and may result in damage to the device or injury.

2. Before installing the product, remove foreign substances and scale from the piping. Be careful that

sealing materials do not contaminate inside of the piping.

*Failure to follow this notice may result in malfunction. Repair due to foreign substances is charged.

3. Install the product vertically with the cap [11] upward. Taking an example with Figure 5, the product

must be vertical against water surface in the tank because the surface is horizontal.

* Failure to follow this notice prevents the product from functioning properly and discharging the

pressure from the outlet.

4. Securely support and fasten the pipes.

(See “7.1 Fitting pipe base” and “7.2 Discharge pipe.”)

* The product may be deformed and does not open or close if excessive stress is applied.

5. Do not apply flow rate with the accumulation of more than 25% to the product, or flow velocity at the

outlet side exceeds 2 m/s and causes noise and vibration.

6. Secure enough space around the product for its maintenance and inspection.

■EPDT-351■

7.1 Fitting pipe base (See Figure 5.)

(1) Fitting pipe base should have enough strength and rigidity against the stress induced by reaction

force in the opposite direction of the exhaust through the axis of the exhaust pipe.

(2) Equip the discharge pipe with a support to avoid excessive load, deflection, or vibration.

(3) Install the product at a place where its maintenance and inspection can be performed.

7.2 Discharge pipe (See Figure 5.)

Diameter of the discharge pipe should be the same or larger than that of the outlet of the product.

Foot valve

Pump

Flexible joint

heck valve

Water

tank

upport

Discharge

Discharge pipe

Pillar

Support

itting pipe

base

Fluid inlet

Figure 5. Piping example

Secure at least

500mm for

maintenance

As short as possible

Select a pipe with the same

or larger diameter than the

outlet diameter of the valve

■EPDT-351■

7.3 Set pressure adjustment (See 4. Structure)

Warning

To adjust the set pressure, remove the cap [11], make a 1/4 to 1/3 turn of the

adjusting screw [9] slowly as checking the pressure gauge, and check the

operation each time after turning the adjusting screw [9]. Be careful not to overturn

or the fluid may suddenly blow out. The fluid leaks from the thread of the

adjusting screw [9] while adjustment. Be careful not to get injured or scalded and

not to make the surroundings dirty. When it is difficult to adjust by yourself, please

* Hot fluid may cause injury and scalds when it blows out.

Caution

Do not try to adjust the set pressure beyond the set pressure range defined per

spring. Please refer to Table 4. Set pressure range.

* Failure to follow this notice results in malfunction.

Table 4. Set pressure range

Nominal size Set pressure range (MPa)

Spring range A B C D E

15-50A 0.05

up to 0.2

Over 0.2

up to 0.4

Over 0.4

up to 0.65

Over 0.65

up to 1.0

Over 1.0

up to 1.6

When a set pressure is not specified, confirm if the set pressure range is proper by checking the

alphabet punched on the edge of the screwed connection. (See below.)

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