Yoshitake AL-150TML is a lever-type, closed-structure safety relief valve designed to prevent accidents caused by abnormal pressure rise in various pressure vessels, instrumentation devices, and at the outlet of pressure reducing valves. It features a dash-pot structure and soft seat for excellent airtightness, making it highly suitable for applications where valve seat leakage is not tolerated.

Features

• Lever Type Operation: A discharge inspection can be manually performed when the difference between the set pressure and the inlet pressure is within specified limits.
• Excellent Airtightness: Ensured by the valve seat incorporating a soft seat (O-ring). Most suitable for applications where valve seat leakage is not tolerated.
• Corrosion Resistance: The trim parts (valve and valve seat) and adjusting spring are made of stainless steel. The trim parts use SCS14A (equivalent to SUS316) for outstanding corrosion resistance.
• Closed Structure: Prevents fluid leakage to the outside.

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

INFO

Please contact us when using for oil.

Dimensions and Weights

Nominal size	d	D (mm)	L (mm)	H1 (mm)	H (mm)	Flow area (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

For Air (20°C) [kg/h](Pressure vessel structure standard)

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
40A	169	221	321	431	542	652	762	872	982	1093	1203
50A	262	341	496	666	836	1006	1176	1346	1516	1687	1857

For Water (accumulation: 25%) [m³/h](Yoshitake standard)

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
40A	2.7	3.8	6.5	7.9	9.2	10.3	11.3	12.2	13.0	13.8	14.6
50A	4.1	5.9	10.0	12.3	14.2	15.9	17.4	18.8	20.1	21.3	22.4

Structure and Materials

No.	Name of Parts	Material
1	Spring Case	Bronze (CAC406)
2	Valve Seat	Cast Stainless Steel (SCS14A)
3	Valve	Cast Stainless Steel (SCS14A)
4	Valve Cover	Stainless Steel (SUS304)
5	O Ring	FKM
6	C Ring	Stainless Steel (SUS)
7	Spindle	Brass (C3604)
8	Spring	Stainless Steel (SUS304)
9	Bottom Spring Plate	Brass (C3604)
10	Top Spring Plate	Brass (C3604)
11	Adjusting Screw	Brass (C3604)
12	Lock Nut	Brass (C3604)
13	Cap	Brass (C3604)
14	Gasket	PTFE
15	Gasket	PTFE
16	Name Plate	Stainless Steel (SUS304)
18	Spring Pin	Stainless Steel (SUS)
19	Lever	Stainless Steel (SUS430)
20	Connecting Rod	Brass (C3604)
21	O Ring	FKM
22	Spring Pin	Stainless Steel (SUS)

Installation

WARNING

1. Do not install any closing device such as a stop valve at inlet or outlet sides of the product.
2. Install an exhaust pipe on outlet side of the product, and lead it to a place where there is no risk of physical damage even if fluid blows out.
3. When installing, tighten the hexagonal part of the valve seat with a spanner. Do not adjust its direction by rotating the outlet piping.
4. Do not apply viscous fluid that may make fixation of the valve and valve seat.

TIP

• Before installing the product, remove foreign substances and scale from the piping.
• Install the product vertically with the cap facing upward.
• Securely support and fasten the pipes.
• Inner diameters of pipe mount and of exhaust pipe shall be more than those of each inlet and outlet of the product.

Maintenance and Troubleshooting

Daily Inspection:

• Check for leakage from between the cap and the O-ring.
• Check for corrosion or crack on the product.
• Check for leakage from the product under normal working pressure.
• Check for leakage from the joint between the product and piping.

Regular Inspection (once per 6 months):

• Check that there is no loose piping at inlet and outlet side of the product.
• Check the operation of the product by lifting up the lever, while differential pressure between the set and inlet pressures is within the allowed range.

DANGER

Do not adjust the set pressure of the AL-150TML. Do not remove the cap. Failure to follow this notice may cause danger due to blow-off from the adjusting screw.