Relief ValvesLift Type
Model comparison
Compare only the points that determine the choice: function or construction, applicable medium, operating range, body material, and connection or nominal size. Open the model page to confirm the full specification.
| Model | Key selection point | Medium | Operating range | Body material | Connection / size |
|---|---|---|---|---|---|
| AL-10 | Lift Type Safety Valve | Steam | 0.05-1.0 MPa 220℃ | — | JIS Rc screwed; 0.05-1.0 MPa, 220℃, Ductile Cast Iron |
| AF-1 | Open Type Safety Relief Valve | Steam | 0.18-1.6 MPa 220°C | — | 20A: Inlet R1, Outlet Rp1; 25A: Inlet R 1-1/4, Outlet Rp 1-1/4; 32A: Inlet R 1-1/2, Outlet Rp 1-1/2; 40A: Inlet R2, Outlet Rp2; 50A: Inlet R 2-1/2, Outlet Rp 2-1/2 |
| AF-10EN | Full Bore Safety Valve, Lever Type | Steam, Air, Other non-dangerous gases | 0.1 to 1.6 MPa 250 °C | — | EN PN16 flanged; 20A: 20 x 32 mm, Flow area 268 mm²; 25A: 25 x 40 mm, Flow area 415 mm²; 32A: 32 x 50 mm, Flow area 683 mm²; 40A: 40 x 65 mm, Flow area 1046 mm²; 50A: 50 x 80 mm, Flow area 1661 mm²; 65A: 65 x 100 mm, Flow area 2780 mm²; 80A: 80 x 125 mm, Flow area 4185 mm²; 100A: 100 x 150 mm, Flow area 6503 mm² |
| AF-2 | Full Bore Safety Relief Valve | Steam | 0.18-1.6 MPa 220°C | — | 65A: Nominal size 65A; 80A: Nominal size 80A |
| AF-4 | AF-4M Open Type Safety Relief Valve | Steam, air, other non-dangerous fluids | 0.1 - 1.0 MPa 220℃ | Ductile cast iron | JIS 10K FF flanged, JIS 10K RF flanged; Open type safety relief valve with lifting lever |
| AF-4M | Full Bore Safety Valve, Open Type | Steam, Air, Other non-dangerous fluids | 0.1-1.0 MPa 220°C | — | JIS 10K FF flanged, JIS 10K RF flanged; Open type without lever |
| AF-5 | Full Bore Safety Valve | — | 0.1-2.0 MPa 220°C | — | JIS R / JIS Rc; Cast bronze, 0.1-2.0 MPa |
| AF-5S | AF-5 Full Bore Safety Relief Valve | Steam, Air, Other non-dangerous fluids | 0.1-2.0 MPa (AF-5) / 0.1-1.0 MPa (AF-5S) 220°C | — | Stainless steel spring case, 0.1-1.0 MPa |
| AL-140 | Safety Relief Valve, Closed Type | Steam, Air, Cold and hot water, Oil, Other non-dangerous fluids | 0.05-1.0 MPa 220°C (150°C for liquids) | — | JIS Rc screwed; Working pressure: 0.05-1.0 MPa, Max 220°C |
| AL-140H | Stainless Steel Safety Relief Valve | Steam, Air, Cold and hot water, Oil, Other non-dangerous fluids | 1.0 - 2.0 MPa 220°C (150°C for liquids) | — | JIS Rc screwed; 1.0-2.0 MPa, Closed type |
| AL-140T-N | Safety Relief Valve | Cold and hot water | 0.05-1.0 MPa 5-100℃ | — | JIS Rc screwed; For cold and hot water, 5-100℃, JWWA approval |
| AL-140T | Safety Relief Valve | — | 0.05-1.0 MPa 5-120°C | — | JIS Rc screwed; Air, water, oil, closed type |
| AL-140TML | — | — | 0.05-1.0 MPa 5-120°C | — | JIS Rc screwed; Closed type with lever |
| AL-140TML-N | Safety Relief Valve for Cold and Hot Water | Cold and hot water | 0.05-1.0 MPa 5-100°C | — | JIS Rc screwed; Closed type with lever, cold and hot water, 0.05-1.0 MPa |
| AL-150 | Safety Relief Valve, Closed Type | Steam, Air, Hot and cold water, Oil, Other non-dangerous fluids | 0.05 - 1.0 MPa 5 - 220°C (Max 150°C for liquids) | — | JIS Rc screwed; Standard closed type, 0.05-1.0 MPa |
| AL-150T | Safety Relief Valve, Closed Type | — | 0.05-1.0 MPa 5-120°C (AL-150T) / 5-100°C (AL-150T-N) | — | JIS Rc screwed; Bronze spring case, 5-120°C |
| AL-150L | Safety Relief Valve | Steam, Air | 0.05-1.0 MPa 220°C | — | JIS Rc screwed; 0.05-1.0 MPa, JIS Rc screwed |
| AL-150H | Lift Type Safety Relief Valve, Closed Type, 1.0-1.6 MPa | — | 1.0 - 1.6 MPa | — | JIS Rc screwed; 1.0-1.6 MPa, Closed type, Lift type |
| AL-150T-N | Relief Valve (Soft Seat) | Cold and hot water | 0.05-1.0 MPa 5-100°C | — | JIS Rc screwed; Cold and hot water, 0.05-1.0 MPa |
| AL-150TML | Lever Type Closed Safety Relief Valve | Air, Cold and hot water, Oil, Other non-dangerous fluids | 0.05-1.0 MPa 5-120°C | — | JIS Rc screwed; Standard model, 5-120°C |
| AL-150TML-N | AL-150TML / Safety Relief Valve | — | 0.05 - 1.0 MPa 5 - 120°C (AL-150TML), 5 - 100°C (AL-150TML-N) | — | JIS Rc screwed; Bronze (NPB treated) spring case, 5-100°C, JWWA approved |
| AL-17 | Closed Type Safety Relief Valve | Steam, Air, Cold and hot water, Oil, Other non-dangerous fluids | 0.05-1.6 MPa 220°C | — | JIS Rc screwed; 0.05-1.6 MPa, 220°C |
| AL-24 | AL-24F Lift Type Safety Relief Valve | — | 0.1-0.7 MPa 60°C (AL-24) / 120°C (AL-24F) | — | JIS Rc screwed; Cold and hot water, Max 60°C |
| AL-24F | Safety Relief Valve | Cold and hot water, Oil, Other non-dangerous fluids | 0.1-0.7 MPa (0.05-0.1 MPa available) 120℃ | — | JIS Rc screwed; For cold/hot water, oil, non-dangerous fluids up to 120℃ with FKM diaphragm |
Process scope
Yoshitake safety and relief valves protect equipment from excessive pressure. The local catalogue includes open-lever steam safety valves, enclosed relief valves for several fluids, low-pressure water relief products, and a vacuum-relief valve. Selection must follow the protected equipment, set pressure, required relieving capacity, fluid, discharge route, and applicable code.
Project-specific checks
- Identify the protected equipment, governing code, set pressure, accumulation/overpressure basis, and required relieving capacity.
- Confirm fluid phase, temperature, materials, connection, and certified or project-required configuration.
- Design a safe discharge route with allowable back pressure, drainage, support, and personnel protection.
- Record test, sealing, inspection, isolation, and maintenance requirements; do not alter a set pressure without approved procedure.
Final verification
This guide groups local Yoshitake catalogue pages for preliminary engineering review. The model-specific Yoshitake documentation, sizing calculation, materials confirmation, and applicable site requirements control the final order and installation decision.
Available models
Open a model page for specifications, connection options and technical documents.
Relief ValvesOpen Type with Lev...
AF-1 Open Type Safety Relief Valve
Relief ValvesFull Bore
AF-10EN Full Bore Safety Valve, Lever Type
Relief ValvesFull Bore
AF-2 Full Bore Safety Relief Valve
Relief Valves0.1-1.0 MPa
AF-4 / AF-4M Open Type Safety Relief Valve
Relief ValvesFull Bore
AF-4M Full Bore Safety Valve, Open Type
Relief ValvesFull Bore
AF-5 Full Bore Safety Valve
Relief ValvesFull Bore
AF-5S, AF-5 Full Bore Safety Relief Valve
Relief ValvesClosed Type
AL-140 Safety Relief Valve, Closed Type
Relief ValvesClosed Type
AL-140H Stainless Steel Safety Relief Valve
Relief ValvesClosed Type
AL-140T-N Safety Relief Valve
Relief ValvesClosed type
AL-140T Safety Relief Valve
Relief ValvesJWWA Approval
AL-140TML-N Safety Relief Valve for Cold and Hot Water
Relief ValvesClosed Type
AL-150 Safety Relief Valve, Closed Type
Relief ValvesLift Type
AL-150H Lift Type Safety Relief Valve, Closed Type, 1.0-1.6 MPa
Relief ValvesOpen Type with Lev...
AL-150L Safety Relief Valve
Relief ValvesClosed Type
AL-150T-N Relief Valve (Soft Seat)
Relief ValvesSoft Seat
AL-150T Safety Relief Valve, Closed Type
Relief ValvesSoft Seat
AL-150TML-N AL-150TML / Safety Relief Valve
Relief ValvesLever Type
AL-150TML Lever Type Closed Safety Relief Valve
Relief ValvesClosed type
AL-17 Closed Type Safety Relief Valve
Relief ValvesLift Type
AL-24, AL-24F Lift Type Safety Relief Valve
Relief ValvesSafety Relief Valv...
AL-24F Safety Relief Valve
Relief ValvesClosed Type
AL-250 / AL-250R Stainless Steel Relief Valve
Relief ValvesClosed Type
AL-250R Closed Type Relief Valve with Handle
Relief ValvesClosed Type
AL-260 / AL-260R Cast Bronze Relief Valve
Relief ValvesClosed Type
AL-260R Closed Type Relief Valve with Handle
Relief ValvesClosed Type
AL-27 Safety Relief Valve
Relief ValvesClosed type
AL-280 Relief Valve
Relief ValvesClosed type
AL-300 Series Safety Relief Valve
Relief ValvesClosed type
AL-300T / AL-301T Lift Type Safety Relief Valve
Relief ValvesClosed type
AL-301 Closed Type Safety Relief Valve (Stainless Steel Trim)
Relief ValvesClosed Type
AL-301T Safety Relief Valve, Closed Type, Stainless Steel
Relief ValvesStainless Steel
AL-31, AL-31H Safety Relief Valve Closed Type
Relief ValvesStainless Steel
AL-31H Safety Relief Valve 1.0-2.0 MPa
Relief ValvesClosed type
AL-32 Safety Relief Valve, Closed Type, Stainless Steel
Relief ValvesStainless Steel
AL-32ML Safety Relief Valve, Closed Type with Lever
Relief ValvesClosed Type
AL-32T-N Closed Type Safety Relief Valve
Relief ValvesClosed Type
AL-32T Safety Relief Valve
Relief ValvesLever Type
AL-32TML-N Lever Type Closed Safety Relief Valve
Relief ValvesLever Type
AL-32TML Safety Relief Valve
Relief ValvesClosed type
AL-4 / AL-4T Closed Type Safety Relief Valve 1.5 MPa
Relief ValvesLever Type
AL-400L / AL-400TL Lever Type Safety Relief Valve
Relief ValvesClosed Type
AL-400TL Closed Type Lever Safety Relief Valve
Relief ValvesClosed Type
AL-4S / AL-4ST Safety Relief Valve
Relief ValvesClosed type
AL-4ST Closed Type Safety Relief Valve
Relief ValvesClosed type
AL-4T Safety Relief Valve
Relief ValvesLift type
AL-5 Safety Relief Valve
Relief ValvesBronze Body
AL-50 Bronze Relief Valve for Hot Water
Relief ValvesBronze Body
AL-52F-95 Home Boiler Relief Valve, 95 kPa
Relief Valves95 kPa
AL-52FS-95 Relief Valve, 95 kPa, JIS Screwed
Relief ValvesSteam Application
AL-6 Safety Relief Valve, Open Lever Type for Steam
Relief Valves97 kPa Commence-to...
AL-68-97 Relief Valve for Hot Water Heat Exchangers
Relief Valves100°C Max
AL-72F-95 Home Boiler Relief Valve
Relief ValvesDirect Type
GD-7R Primary Pressure Regulating Valve, Direct Type
Relief ValvesSteam & Air