The Yoshitake AL-17 is a closed type, lift-type safety relief valve designed for high-pressure gas testing and non-leakage applications. The trim parts (valve and valve seat) are constructed from stainless steel, providing exceptional corrosion resistance and durability. It is suitable for steam, air, cold and hot water, oil, and other non-dangerous fluids.

Features

1. Safety relief valve with the trim parts (valve and valve seat) of stainless steel, offering high corrosion resistance and durability in particular.
2. Popping structure ensures reliable discharge.

Specifications

Structure	Closed type
Application	Steam, Air, Cold and hot water, Oil, Other non-dangerous fluids
Working pressure	0.05-1.6 MPa
Maximum temperature	220°C*
Material (Spring case)	Ductile cast iron
Material (Valve, valve seat)	Stainless steel
Connection	JIS Rc screwed

INFO

• The maximum temperature is 150°C when using for water, oil, or other liquids. Please refer to the manufacturer chart for set pressure range.

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	40	40	143	20.1	0.9
20A	Rc 3/4	21	45	50	162	34.6	1.2
25A	Rc 1	26	50	60	182	53.0	1.7
32A	Rc 1-1/4	33	60	70	220	85.5	2.9
40A	Rc 1-1/2	41	65	75	238	132.0	3.8
50A	Rc 2	51	80	85	272	204.2	6.3

Certified Capacity

For steam (saturation temperature)

Pressure vessel structure standard. Capacity in kg/h.

Pressure (MPa) / Nominal size	0.05	0.1	0.2	0.3	0.4	0.5	0.6	0.7	0.8	0.9	1.0	1.1	1.2	1.3	1.4	1.5	1.6
15A	15	20	29	40	50	60	70	80	90	100	109	119	129	139	149	158	168
20A	27	35	51	69	87	104	121	138	155	172	189	206	222	239	256	273	290

For air (20°C)

Pressure vessel structure standard. Capacity in kg/h.

Pressure (MPa) / Nominal size	0.05	0.1	0.2	0.3	0.4	0.5	0.6	0.7	0.8	0.9	1.0	1.1	1.2	1.3	1.4	1.5	1.6
15A	25	33	48	65	81	98	114	131	147	164	181	197	214	230	247	264	280
20A	44	57	83	111	140	169	197	226	254	283	311	340	368	397	426	454	483

For water (accumulation: 25%)

Yoshitake standard. Capacity in m³/h.

Pressure (MPa) / Nominal size	0.05	0.1	0.2	0.3	0.4	0.5	0.6	0.7	0.8	0.9	1.0	1.1	1.2	1.3	1.4	1.5	1.6
15A	0.2	0.3	0.5	0.6	0.7	0.8	0.8	0.9	1.0	1.0	1.1	1.1	1.2	1.2	1.3	1.3	1.4
20A	0.4	0.6	0.8	1.0	1.2	1.3	1.5	1.6	1.7	1.8	1.9	2.0	2.1	2.2	2.3	2.3	2.4

Parts List and Cross Section

No.	Part Name	Material
16	Name Plate	Stainless Steel
15	Gasket	PTFE
14	Gasket	PTFE
13	Set Screw	Brass
12	Lock Nut	Brass
11	Adjusting Screw	Brass
10	Spring	Piano Wire
9	Spring Plate (Upper)	Brass
8	Spring Plate (Lower)	Brass