Yoshitake AF-7 Instruction Manual Download Page 7

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PDT-168

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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.

Summary of Contents for AF-7

Page 1: ...essure vessel structure specifications Boiler structure specifications 4 6 2 For Air Pressure vessel structure specifications 4 7 I n s t al la t i on 7 1 Example of piping 5 7 2 Warnings and cautions...

Page 2: ...ange 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 valv...

Page 3: ...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 5...

Page 4: ...re 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...

Page 5: ...ssure from the fluid coming in from the back of the valve holder back pressure adds to the pressure for the valve to close 6 Size selection tables 6 1 For steam Saturation temperature Pressure vessel...

Page 6: ...stalled 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...

Page 7: ...f 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 fla...

Page 8: ...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...

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