Yoshitake AL-150T-N closed type safety relief valve. This relief valve features excellent airtightness ensured by the valve seat incorporating a soft seat (O-ring). It is most suitable for cold and hot water applications where valve seat leakage is not tolerated, and it holds JWWA (Japan Water Works Association) approval.

The trim parts (valve and valve seat) and adjusting spring are made of stainless steel. The material used for the trim parts is SCS14A (equivalent to SUS316) providing outstanding corrosion resistance. Its closed structure effectively prevents fluid leakage.

Specifications

Model	AL-150T-N
Structure	Closed type
Application	Cold and hot water
Working pressure	0.05-1.0 MPa
Working temperature	5-100°C
Spring case	Bronze (NPb-treated)
Valve, valve seat	Stainless steel (SCS14A)
Adjusting spring	Stainless steel
O-ring	FKM
Connection	JIS Rc screwed

INFO

JWWA approval applies to the AL-150T-N model.

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	128	20.1	0.7
20A	Rc 3/4	21	38	43	128.5	34.6	0.8
25A	Rc 1	26	43	51.5	144.5	53.0	1.1
32A	Rc 1-1/4	33	50	61.5	181.5	93.3	1.8
40A	Rc 1-1/2	41	60	60	205	135.2	2.8
50A	Rc 2	51	75	76	245.5	208.2	4.7

Soft Seat Design

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

Certified Capacity Table (Water)

Capacity for water (accumulation: 25%) according to Yoshitake standard (m³/h):

Nominal size	0.05 MPa	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	0.4	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	2.6	3.7	6.5	8.0	9.2	10.3	11.3	12.2	13.1	13.9	14.6
50A	4.0	5.7	10.0	12.3	14.2	15.9	17.4	18.8	20.1	21.4	22.5