Yoshitake AF-7 Manual de usuario

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Instruction Manual

　　　Thank you very much for purchasing our safety valves.

Please read this instruction manual thoroughly before using the safety valve, so that 　　　

you may do so correctly and safely. Please carefully store this manual in a handy place.

－－－－－－The following safety symbols are used in this manual.－－－－－





Warnings





Cautions

Contents

Overview･･･････････････････････････････････････････････1

1. Features･････････････････････････････････････････････1

2. Specifications････････････････････････････････････････1

3. Dimensions and weights･･････････････････････････2

4. Structure････････････････････････････････････････････3

5.Operation･････････････････････････････････････4

6.Size selection table .

　6.1 For Steam (Pressure vessel structure specifications

　　　　　　　　　　　　　　　・ Boiler structure specifications)･････4

　6.2 For Air (Pressure vessel structure specifications )･･････4

7. Installation

　7.1 Example of piping･････････････････････････････････5

　7.2 Warnings and cautions of product installation････････5～6

8. Maintenance

　8.1 Daily inspection･･････････････････････････････････6

　8.2 Operational inspection････････････････････････････････7

　8.3 Periodic inspection･･･････････････････････････････････7

　8.4 Troubleshooting ･･････････････････････････････････････7

After sales service

This symbol indicates a potentially hazardous situation that, if not avoided,

could result in death or serious injury.

This symbol indicates a hazardous situation that, if not avoided, may result in

minor or moderate injury. (“Caution” may also be used to indicate other unsafe

ractices or risks of

ert

dama

)

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- 1 -

Overview

Suited for installation on steam boilers, various pressure vessels, instrumentation apparatus, and the

secondary side of pressure reducing valves. Yoshitake’s Safety Relief Valves prevent accidents due to

the abnormal rise in piping pressure.

1. Features

(1) The product is designed according to JIS B 8210 for spring loaded safety relief valves for

steam boilers and gas pressure vessels.

(2) The sealed structure of model AF-7M prevents any external leakage of fluid during operation.

2. Specifications

Model AF-7 AF-7M

Type Open lever type*1Enclosed type*2

Fluids Steam, air, and other

non-corrosive gases Air and other non-corrosive gases

Pressure range 0.1 ~ 1.0 MPa

Temperature range 5 ~ 350 ℃5 ~ 300℃

Super imposed back pressure 0 MPa

Connections Inlet: JIS 10K RF flange or JIS 20K RF flange (JIS B 2238)

Outlet: JIS 10K FF flange (JIS B 2238)

Size (mm) 25, 40, 50, 65, 80, 100

Body Carbon steel casting

Material Valve & valve seat Stainless steel

*1 A safety valve which is so constructed that a part of the fluid blown off from the valve seat

opening is also discharged outside from other part than the valve outlet.

*2A safety valve which is so constructed that the fluid blown off from the valve seat opening

is not allowed to discharge outside from other part than the valve outlet.





Warnings

(1) Do not use this product on equipment and apparatus that do not allow any valve seat leakage.

＊This product has valve seat leakage within tolerance, and cannot be sealed completely

(Zero valve seat leakage cannot be obtained).

This product cannot be used for apparatus and facilities with considerable vibration.

＊Vibration may cause the product to make errors.





Cautions

Please confirm that the indications on the product name plate coincide with the specifications of

the ordered product model before usage.

＊In case they do not coincide, do not use the product and contact us.

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3. Dimensions and Weights

Figure １Dimensions （Model AF-7）

Connection

flange ＊H2 (mm)

Size

(mm) Inlet ×

Outlet

(mm)

Blowout

area (mm2)

Rated lift

(mm)

(mm) AF-7 AF-7M

Weight

(kg)

25 25×32 16 200.9 4.0 100 85 226 231 10

40 40×50 25 490.6 6.3 120 110 273 270 20

50 50×65 32 803.8 8.0 135 120 325 321 25

65 65×80 40 1256.0 10.0 160 125 366 361 40

80 80×100 50 1962.5 12.5 170 135 375 370 52

100 100×125 65 3316.6 16.3 205 160 612 580 75

＊All values for types AF-7 and AF-7M are identical except dimension of H2.

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4. Structure

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　Figure 2 Structure

No. Name of parts No. Name of parts

1 Body 14 Nut

2 Valve seat 15 Spring

3 Drain plug (R3/8) 16 Spindle

4 Seat ring 17 Spring chamber

7 Valve 19 Lever (on Model AF-7)

10 Valve holder 26 Name plate

11 Guide 29 Seal

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5．Operation

Discharge

When the pressure at the inlet side of the safety valve rises and approaches the set pressure, the

fluid pressure which pushes the valve ⑦approaches the pressure of the spring ⑮which is

holding down the valve ⑦. Pre-leaking which is as low as 3% of the discharge pressure occurs at

this point. (The pressure at this point is called the commence to discharge pressure. In case of

safety valve for gases, the set pressure is generally the commence to discharge pressure.)

The fluid which has started to pre-leak gradually accumulates in the valve holder ⑩, and when it

reaches the prescribed discharge pressure, the valve pops. (The pressure at this point is called the

popping pressure. In case of safety valves for steam, the set pressure is generally the popping

pressure.)

Closing

When the valve ⑦pops, and the fluid is discharged into the air, the pressure on the safety valve

inlet decreases, lowering the pressure of the fluid to raise the valve. Thus, the resilience of the

spring ⑮becomes stronger, and the valve closes. When the safety valve is discharging, the

pressure from the fluid coming in from the back of the valve holder ⑩(back pressure) adds to the

pressure for the valve to close.

6. Size selection tables

6.1 For steam (Saturation temperature)

[Pressure vessel structure specifications・Boiler structure specifications ] (kg/h)

Set pressure (MPa)

size

(mm)

Bore of

throat

(mm)

Blowout

area

(mm2)0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

25 16 200.9 180 250 335 421 504 586 668 748 829 911

40 25 490.6 440 612 818 1028 1230 1432 1631 1828 2026 2225

50 32 803.8 721 1003 1341 1685 2016 2347 2673 2996 3320 3645

65 40 1256.0 1127 1567 2095 2633 3151 3667 4177 4682 5188 5697

80 50 1962.5 1761 2446 3274 4115 4923 5730 6526 7315 8106 8901

100 65 3316.6 2976 4139 5533 6954 8320 9684 11029 12363 13700 15043

6.2 For air (20℃) [Pressurevesselstructurespecifications] (kg/h)

Set pressure (MPa)

size

(mm)

Bore of

throat

(mm)

Blowout

area

(mm2)0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

25 16 200.9 278 424 570 716 862 1008 1154 1300 1446 1592

40 25 490.6 680 1036 1393 1749 2106 2462 2819 3175 3532 3888

50 32 803.8 1114 1698 2282 2866 3451 4035 4619 5203 5787 6371

65 40 1256.0 1742 2654 3567 4479 5392 6305 7217 8130 9042 9955

80 50 1962.5 2722 4148 5573 6999 8425 9851 11277 12703 14129 15555

100 65 3316.6 4600 7010 9419 11829 14239 16649 19058 21468 23878 26288

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7. Installation

7.1 Example of piping

Figure 3 Figure of piping example (for steam)

7.2 Warnings and cautions for product installation





Warnings

(1) This product is very heavy. Use a suspension or other device to support it securely at

installation.

＊The falling of the product may result in injuries.

(2) Attach an exhaust pipe onto the outlet so that the fluid is led to a safe place at discharge.

＊Be aware of scalding and other injuries at discharge.





Cautions

(1) Cleanse the inside of the pipe thoroughly and remove any dust or scales before installing the

product.

＊Remaining dust from insufficient cleansing may obstruct proper operation of the product.

(2) Remove the caps on the inlet and outlet of the product before installation.

(3) Match the fluid flow direction with the inlet and outlet of the product to ensure proper

installation.

＊The product will not function if installed improperly.

(4) Please make sure that the product is installed in the proper direction.

＊The product will not function if installed in an improper direction.

(5) Securely support and fasten the piping.

＊Excess stress on the piping will cause deformation, obstructing proper opening and closing of

the valve.

(6) Do not remove the seal from the product.

(7) Upon installation, please choose a place with sufficient space for removal of the product.

＊Insufficient space will obstruct exchange and other necessary work on the product.

(8) If the product is installed in a place where the fluid discharge may trigger the alarm or soil

other equipment, extend the exhaust pipe to the outside of the building.

＊Lack of consideration for the location of the exhaust pipe end can result in soiling of other

equipment.

(9) Please ensure that the piping connections are secure.

＊Improper connections can result in leaking from the joints with vibrations, and scalding from

the fluid.

(10) Since the fluid leaks from model AF-7 upon operation, please take measures to prevent

soiling of other equipment.

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●Cleansing the inside of the piping

(1) Please cleanse the inside of the pipe thoroughly and remove any dust or scales before

installing the product. Please note that all repairs for disorders due to foreign matters shall

be charged.

●Installation pipe mount for the safety valve

(1) The pipe mount for the safety valve should have sufficient strength and rigidity

against compression, shear and bending stress that is caused in the reaction against

the exhaust flowing up through the exhaust pipe attached to the safety valve.

(2) Install the safety valve vertically as close as possible to the can body and header. By

doing so, the pressure loss of the mount can be suppressed, preventing decrease in

the discharge volume and unstable functioning of the safety valve.

●Installation of an exhaust pipe onto the safety valve

(1) Install an exhaust pipe and expansion joint so that the stress caused by the thermal

expansion of the equipment or the fluctuation of the exhaust pipe due to the heat of

the safety valve does not affect the safety valve.

●Installation of the flange on the safety valve inlet

(1) As the valve seat is screwed on to the flange inlet, there is a difference in level on the

flange surface of this product. Upon installation, apply a flange gasket that suits the

nominal size and make sure that the gasket seals the valve seat completely (See

Figure 4).

　　　　　　　　　　　　　　　　　　　　Figure 4 Installation of flange on the inlet

8．Maintenance





Cautions

(1) Be sure to wear gloves when touching the product or piping.

＊Be aware of scalding or injuries.

(2) Wear earplugs when checking the operation of the product, and do not stand in front of the

exhaust pipe .Do not look into the pipe or put your hand out to the pipe.

＊The product makes a loud blowing noise during operation. Be aware of spluttering fluid from

the product.

(3) In case of raising the fluid pressure, check beforehand that no problems will occur regarding

the equipment installed onto the piping.

＊Be aware of damage to the equipment.

(4) Do not disassemble the product.

8.1 Daily inspection

Please check to see if there is any fluid leaking from the product or piping on the outlet side of

the product.

＊Please contact us if you notice anything abnormal.

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8.2 Operational inspection (every half year)

(1) Check to see that installation bolts and nuts at the product inlet and outlet, as well as nuts ⑭

installed on the product are all fastened securely.

(2) In case of model AF-7 (lever type), raise the fluid pressure to 75% of the set pressure or

higher, raise the lever, and check to see that the fluid blows out. In case of type AF-7M

(closed type), raise the fluid pressure to the set pressure, and confirm that the product

operates.

＊Please contact us if you notice anything abnormal.

8.3 Periodic inspection

Implement various voluntary inspections according to the laws. If you are a general user, please

have the facility or works agent implement the inspection.

8.4 Troubleshooting

Problem Cause Measures and treatment

A scale is stuck between

the valve ⑦and valve

seat ②.

Follow the procedures in 8.2(2) and operate

the safety valve. Contact us If the leakage

still fails to stop.

The piping on which the

product is installed vibr-

ates.

This product cannot be used on devices and

equipment that vibrate considerably.

Leakage at the outlet

side.

There is back pressure on

the piping at the outlet

side.

Review and change the piping layout.

Specifications of the prod-

uct and conditions for usa-

ge do not coincide.

Check the set pressure printed on the

nameplate. Exchange the product if the

conditions for usage do not coincide.

The pressure gauge does

not work properly

Calibrate or exchange the pressure gauge.

Operates at pressures

lower than the set pre-

ssure. Changes occurred in the

set pressure of the prod-

uct.

The readjustment of set pressure is needed.

Please contact us.

Specifications of the safety

valve and conditions for

usage do not coincide.

Check the set pressure printed on the

nameplate. Exchange the product if the

usage conditions do not coincide.

The pressure gauge does

not work properly

Calibrate or exchange the pressure gauge.

Changes occurred in the

set pressure of the safety

valve.

The readjustment of set pressure is needed.

Please contact us.

Does not operate even

though the pressure

reaches the set pre-

ssure.

The valve holder ⑩and

the guide ⑪got stuck to-

gether.

The product needs to be disassembled and

cleaned. Please contact us.

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