Yoshitake AL-32TML is a closed-type safety relief valve with a lever, designed for applications requiring high air tightness where valve seat leakage is not tolerated. Constructed from cast stainless steel with a soft seat (O-ring) design, it prevents fluid leakage and offers excellent corrosion resistance. The valve is suitable for air, water, oil, and other non-dangerous fluids, operating at pressures between 0.05 and 1.0 MPa.

Features

• Manual Inspection: Features a lever for manual discharge inspection when the pressure difference is within specified limits.
• Reliable Sealing: The valve seat incorporates a soft seat (O-ring), ensuring exceptional air tightness and zero leakage.
• Corrosion Resistance: Constructed entirely of stainless steel (SCS14A and SUS316 for trim parts), offering high resistance to corrosion.
• Closed Structure: The sealed design effectively prevents any fluid leakage to the external environment.

Required Differential Pressure at a Discharge Inspection

Nominal size	Difference between set pressure at a discharge inspection
15A-25A	1.0 MPa or less
32A, 40A	0.6 MPa or less
50A	0.4 MPa or less

Specifications

Structure	Closed type with a lever
Application	Air, water, oil, other non-dangerous fluids
Working pressure	0.05-1.0 MPa
Working temperature	5-120°C
Material (Spring case)	Cast stainless steel
Material (Valve, valve seat)	Stainless steel (Valve: SCS14A, Seat: SUS316)
Material (Adjusting spring)	Stainless steel
Material (O-ring)	Synthetic rubber (FKM)
Connection	JIS 10K loose flange

INFO

Please contact the manufacturer when using for oil. The maximum temperature is 150°C when the fluid is liquid.

Dimensions and Weights

Nominal size	Dimensions D (mm)	Dimensions L (mm)	Dimensions H₁ (mm)	Dimensions H (mm)	Flow area πD² (mm²)	Weight (kg)
15A	16	63	97	215	20.1	2.5
20A	21	87	101	217	34.6	2.9
25A	26	92	119	245	53.0	4.5
32A	33	99	135	284	93.3	5.3
40A	41	109	140	321	135.2	6.7
50A	51	114	162	372	208.2	11.5

INFO

The outlet flange is 1 size larger than the nominal size.

Structure and Operation

Blowout Operation: As the inlet pressure approaches the blowout pressure, the force of the fluid pushing up the valve approaches the force of the spring pressing it down. The valve commences to blow when the inlet pressure reaches around 3% below the blowout pressure. The fluid accumulates on the pressure groove and pops the valve when the fluid pressure reaches the blowout pressure.

Closing Operation: When the fluid is released, the inlet pressure decreases, lowering the fluid lift force. The repelling force of the spring becomes larger than the fluid lift force, closing the valve. Back pressure from fluid entering the back of the valve also adds to the closing force.

Capacity Tables

For Air (at 20°C)

Capacity (kg/h) <Pressure vessel structure standard>

Nominal size	0.1 MPa	0.2 MPa	0.3 MPa	0.4 MPa	0.5 MPa	0.6 MPa	0.7 MPa	0.8 MPa	0.9 MPa	1.0 MPa
15A	33	48	65	81	98	114	131	147	164	181
20A	57	83	111	140	169	197	226	254	283	311
25A	87	127	171	215	258	302	346	390	433	477
32A	147	214	288	362	435	509	582	656	730	803

For Water (at 20°C, accumulation: 25%)

Capacity (m³/h) <Yoshitake standard>

Nominal size	0.1 MPa	0.2 MPa	0.3 MPa	0.4 MPa	0.5 MPa	0.6 MPa	0.7 MPa	0.8 MPa	0.9 MPa	1.0 MPa
15A	0.5	0.9	1.1	1.3	1.5	1.6	1.8	1.9	2.0	2.1
20A	0.9	1.6	2.0	2.3	2.6	2.8	3.1	3.3	3.5	3.7
25A	1.5	2.5	3.1	3.6	4.0	4.4	4.7	5.1	5.4	5.7
32A	2.6	4.5	5.5	6.3	7.1	7.8	8.4	9.0	9.5	10.0

Installation and Maintenance

WARNING

• Do not install any closing device such as a stop valve at the inlet or outlet sides of the product, as it may hamper the blowout and damage the pressure vessel.
• Install an exhaust pipe on the outlet side and lead it to a safe place to prevent injury or scalds in case of a fluid blowout.
• Do not disassemble the product, and do not loosen the screws of the spring case and valve seat.
• Remove foreign substances and scale from the piping before installation.

• Pipe mount: Should have sufficient strength against the reaction force of the exhaust. To prevent pressure loss, install the product vertically as close as possible to the can body and header. The inner diameter must be larger than the product inlet.
• Exhaust pipe: Install so the product is not subjected to stress from thermal expansion. The inner diameter must be larger than the product outlet to avoid improper back pressure. Lead the pipe outside if fluid blowout could cause alarm activation or contamination.
• Inspection: Perform daily visual and aural checks for leakage and corrosion. Conduct a monthly operation check by raising the fluid pressure to the set pressure.