Yoshitake AL-150TML and AL-150TML-N are closed, lever-type safety relief valves designed for excellent airtightness. These valves feature a soft seat (FKM O-ring) incorporated into the valve seat, making them highly suitable for applications where valve seat leakage is not tolerated. The trim parts, including the valve and valve seat, are constructed from SCS14A stainless steel (equivalent to SUS316) for outstanding corrosion resistance, along with a stainless steel adjusting spring.

The closed dash-pot structure prevents fluid leakage to the outside. A discharge inspection can be manually performed using the lever when the differential pressure is appropriate. The AL-150TML-N model features a bronze spring case with NPB treatment and is certified by the Japan Water Works Association (JWWA).

Features

• Lever Type: A discharge inspection can be manually performed when the difference between the set pressure and the inlet pressure meets the required parameters.
• Excellent Airtightness: Ensured by the valve seat incorporating a soft seat (O-ring). Most suitable for applications where leakage is not tolerated.
• Corrosion Resistant: Trim parts (valve and valve seat) are made of SCS14A (equivalent to SUS316) and the adjusting spring is stainless steel.
• Closed Structure: Prevents fluid leakage.
• High Pressure Gas: Suitable for high pressure gas testing products.

JWWA Approval

The AL-150TML-N model is approved by the Japan Water Works Association (JWWA).

Required Differential Pressure at a Discharge Inspection

Nominal Size	Difference between set pressure and inlet pressure
15A - 25A	1.0 MPa or less
32A, 40A	0.6 MPa or less
50A	0.4 MPa or less

Specifications

Model	AL-150TML	AL-150TML-N
Structure	Closed type with a lever	Closed type with a lever
Application	Air, Cold and hot water, Oil, Other non-dangerous fluids*	Cold and hot water
Working Pressure	0.05 - 1.0 MPa	0.05 - 1.0 MPa
Working Temperature	5 - 120°C	5 - 100°C
Material (Spring Case)	Bronze	Bronze (NPB treated)
Material (Valve, Valve Seat)	Stainless steel (SCS14A)	Stainless steel (SCS14A)
Material (Adjusting Spring)	Stainless steel	Stainless steel
Material (O-ring)	FKM	FKM
Connection	JIS Rc screwed	JIS Rc screwed

Note

• Please contact us when using for oil. Please refer to the manufacturer chart for the set pressure range.

Soft Seat Structure

Soft seat (O-ring) is used for the trim parts, ensuring the reliable airtightness of the valve seat.

Dimensions and Weights

Nominal Size	d	D (mm)	L (mm)	H1 (mm)	H (mm)	Flow Area πDe (mm²)	Weight (kg)
15A	Rc 1/2	16	34	40	157	20.1	0.8
20A	Rc 3/4	21	38	43	158	34.6	0.9
25A	Rc 1	26	43	51.5	174	53.0	1.3
32A	Rc 1-1/4	33	50	61.5	212	93.3	1.9
40A	Rc 1-1/2	41	60	60	246	135.2	3.0
50A	Rc 2	51	75	76	286	208.2	4.9

Certified Capacity Tables

Certified Capacity for Steam (kg/h)

AL-150 for steam (saturation temperature). Pressure vessel structure standard. (Values shown for selected pressures up to 1.0 MPa)

Nominal Size \ Pressure MPa	0.05	0.1	0.2	0.3	0.4	0.5	0.6	0.7	0.8	0.9	1.0
15A	15	20	29	40	50	60	70	80	90	100	109
20A	27	35	51	69	87	104	121	138	155	172	189
25A	42	54	78	105	133	159	186	212	237	263	289
32A	70	91	132	178	224	268	313	356	400	443	487

Certified Capacity for Air (kg/h)

AL-150, 150T, 150TML for air (20°C). Pressure vessel structure standard. (Values shown for selected pressures up to 1.0 MPa)

Nominal Size \ Pressure MPa	0.05	0.1	0.2	0.3	0.4	0.5	0.6	0.7	0.8	0.9	1.0
15A	25	33	48	65	81	98	114	131	147	164	181
20A	44	57	83	111	140	169	197	226	254	283	311
25A	67	87	127	171	215	258	302	346	390	433	477
32A	113	147	214	288	362	435	509	582	656	730	803

Certified Capacity for Water (m³/h)

AL-150, 150T, 150TML, 150TR for water (accumulation: 25%). Yoshitake standard. (Values shown for selected pressures up to 1.0 MPa)

Nominal Size \ Pressure MPa	0.05	0.1	0.2	0.3	0.4	0.5	0.6	0.7	0.8	0.9	1.0
15A	0.4	0.5	0.9	1.1	1.3	1.5	1.6	1.8	1.9	2.0	2.1
20A	0.6	0.9	1.6	2.0	2.3	2.6	2.8	3.1	3.3	3.5	3.7
25A	1.0	1.5	2.5	3.1	3.6	4.0	4.4	4.7	5.1	5.4	5.7
32A	1.8	2.6	4.5	5.5	6.3	7.1	7.8	8.4	9.0	9.5	10.0