Yoshitake AL-150L is an open-type safety relief valve equipped with a lift lever, specifically designed for steam and air applications. It serves to prevent accidents caused by abnormal pressure rises in various pressure vessels and instrumentation devices. The valve operates within a pressure range of 0.05 to 1.0 MPa and can withstand maximum temperatures up to 220°C.

Features

• The trim parts (valve and valve seat) and adjusting spring are made of stainless steel. The valve and valve seat utilize cast stainless steel SCS14A (equivalent to SUS316), offering outstanding corrosion resistance.
• Features a lift lever mechanism that allows a discharge inspection to be manually performed when the system reaches at least 75% of the opening pressure.

WARNING

• Do not apply this product to devices that do not allow any valve seat leakage. The product has allowable valve seat leakage and does not close completely.
• Do not use the product for equipment or devices that vibrate excessively. Excessive vibration may result in malfunction.
• Do not adjust or change the set pressure, as this may result in damage to the equipment.

Specifications

Specification	Description
Structure	Open type with a lever
Application	Steam, Air
Working Pressure	0.05 - 1.0 MPa
Maximum Temperature	220°C
Connection	JIS Rc screwed
Spring Case Material	Cast bronze (CAC406)
Valve & Valve Seat Material	Cast stainless steel (SCS14A)
Spring Material	Stainless steel (SUS304)

Structure

No.	Part Name	Material
1	Spring Case	Bronze (CAC406)
2	Valve Seat	Cast Stainless Steel (SCS14A)
3	Valve	Cast Stainless Steel (SCS14A)
4	Spindle	Brass
5	Spring	Stainless Steel (SUS304)
6	Bottom Spring Plate	Brass
7	Top Spring Plate	Brass
8	Adjusting Screw	Brass
9	Lock Nut	Brass
10	Cap	Brass
11	Gasket	PTFE
12	Lever	Stainless Steel & Rubber
13	Name Plate	Stainless Steel (SUS304)

Dimensions and Weight

Nominal Size	d	D (mm)	L (mm)	H1 (mm)	H (mm)	Flow Area (mm²)	Weight (kg)
15A	Rc 1/2	16	34	40	148	20.1	0.8
20A	Rc 3/4	21	38	43	148	34.6	0.9
25A	Rc 1	26	43	51.5	165	53.0	1.2
32A	Rc 1-1/4	33	50	61.5	201	93.3	1.9
40A	Rc 1-1/2	41	60	60	226	135.2	2.9
50A	Rc 2	51	75	76	266	208.2	4.8

Certified Capacity

For Steam (at saturated temperature)

Capacity in 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	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
40A	105	136	198	266	335	402	468	534	599	664	729
50A	163	211	306	411	518	621	723	824	924	1025	1126

For Air (at 20°C)

Capacity in 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

Installation Notes

DANGER

• Do not install any closing device such as a stop valve at the inlet or outlet sides of the product. This may hamper the blowout of the safety relief valve and result in damage to the pressure vessel.
• Install an exhaust pipe on the outlet side, and lead it to a place where there is no risk of physical damage or injury even if fluid blows out.
• Do not disassemble the product. Disassembly may prevent proper functioning and lead to danger.

Piping Recommendations

• Clean the inside of the pipe thoroughly and remove any dust or scales before installing the product.
• Match the direction of fluid flow with the inlet and outlet of the product respectively.
• Install the product vertically with the cap facing upward.
• The inner diameters of the pipe mount and exhaust pipe must be larger than those of the product's inlet and outlet to avoid improper back pressure.