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SAFETY RELIEF VALVE
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
Caution
1. Specifications··································································· 1
2. Operation ······································································ 2
3. Nominal Size Selection Table ··············································· 3
4. Installation ······································································· 5
5. Maintenance ···································································· 7
MODEL AL-31, 31H
PRODUCT MANUAL
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 or may result in only property damage.
3.1 AL-31 ······································································· 3
3.2 AL-31H ····································································· 4
5.1 Daily inspection ·························································· 7
5.2 Monthly inspection ······················································ 7
5.3 Troubleshooting ·························································· 8
Table of Contents
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■EPDT-436■
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Summary of Contents for Yoshitake AL-31
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Page 1: Table Of Contents
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. -
Page 2: Specifications
1. Specifications Model AL-31 AL-31H Structure Closed type * Steam, Air, Cold and hot water, Oil, Other non-dangerous fluids Application Working pressure 0.05 ~ 1.0 MPa 1.0 ~ 2.0 MPa Maximum 220 ˚C ** temperature JIS 16K RF Connection JIS 10K RF... -
Page 3: Operation
2. Operation Valve Seat Valve Spring Adjusting Screw Pressure Groove Fig.1 Structure ◼ Blowout operation As the inlet pressure approaches the blowout pressure, the force of fluid pushing up the valve [4] approaches the force of the spring [6] pressing down the valve [4]. The safety relief valve commences to blow when the inlet pressure reaches around 3% below the blowout pressure. -
Page 4: Nominal Size Selection Table
3. Nominal Size Selection Table 3.1 AL-31 ■ For steam (at saturated temperature) Capacity <Pressure vessel structure standard> [kg/h] Blowout Set pressure [MPa] Nominal area size 0.05 20.1 34.6 53.0 85.5 132.0 204.2 1016 1116 ■ For air (at 20˚C) Capacity <Pressure vessel structure standard>... -
Page 5: Al-31H
2170 2279 204.2 1840 2008 2177 2345 2514 2682 2851 3020 3188 3357 3525 ■ For water (at 20˚C, accumulation: 25%) Capacity <Yoshitake standard> Blowout Set pressure [MPa] Nominal area size 20.1 34.6 53.0 85.5 132.0 10.0 10.5 204.2 11.5 12.0... -
Page 6: Installation
4. Installation Warning 1. Do not install any closing device such as a stop valve at inlet or outlet sides of the product. 2. Do not apply the product to devices which do not allow any valve seat leakage. * This product is compliant with the 'JIS B 8210 Safety Valves' standard, which allows valve seat leakage and does not close completely (valve seat leakage cannot be zero). - Page 7 ◼ Cleaning the inside of the piping 1. Please clean 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 substances shall be charged. ◼...
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Page 8: Maintenance
5. Maintenance Warning 1. Do not touch the product/pipes with bare hands. * Failure to follow this notice may result in scalds or injury in case that fluid is hot. 2. When checking the operation of the product, wear earplugs and stand clear of exhaust pipe end during inspection. -
Page 9: Troubleshooting
The product is installed at outlet 4. The pressure reducing valve needs to be side of pressure reducing valve repaired. If it is Yoshitake’s product, please which is out of order, and the contact us. reduced pressure of the valve is getting higher than expected. -
Page 10: Warranty Information
( e.g. in case of corrosion due to outdoor use). Fire, flood, earthquake, thunder and other natural disasters. Consumable parts such as O-ring, gasket, diaphragm and etc. Yoshitake is not liable for any damage or loss caused by malfunction or defect of the product. PDD-046f...
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