The Yoshitake AL-5 is a lift-type safety relief valve designed specifically for steam applications. It features an open-type structure with a lever and is constructed with a ductile cast iron valve and spring case. The valve is available in standard and stainless steel trim configurations, accommodating working pressures up to 1.5 MPa and maximum temperatures of 220°C.

Features

• Due to the lift lever mechanism, a discharge inspection can be manually performed at more than 75% of the opening pressure.
• Chinese TS certification products are available.

Specifications

Specification	Standard	Trim SUS
Structure	Open type with a lever	Open type with a lever
Application	Steam	Steam
Working pressure	0.05-1.0 MPa	0.05-1.5 MPa
Maximum temperature	220°C	220°C
Valve case / Spring case	Ductile cast iron	Ductile cast iron
Valve, valve seat	Bronze	Stainless steel
Connection	JIS 10K FF flanged	JIS 10K FF flanged / JIS 16K FF flanged*

* JIS 16K FF flanged when working pressure is more than 1.0 MPa.

INFO

Please refer to the manufacturer's chart for the set pressure range.

Dimensions

Nominal size	L (mm)	H1 (mm)	H (mm)	D (mm)	Flow area $\pi D\ell$ (mm²)
20A	90	75	276	21	34.6
25A	95	90	295	25	49.1
32A	100	95	331	35	96.2
40A	110	105	347	40	125.6
50A	115	110	388	50	196.4

Certified Capacity

Pressure Vessel Structure Standard

For steam (saturation temperature). Capacity in kg/h.

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	1.1	1.2	1.3	1.4	1.5
20A	27	35	51	69	87	104	121	138	155	172	189	206	222	239	256	273
25A	38	50	73	98	123	148	172	196	220	244	268	292	316	340	364	387
32A	76	98	143	192	241	290	337	384	431	478	525	572	619	666	713	759
40A	99	128	186	250	315	278	440	502	563	625	686	748	809	870	931	991
50A	155	201	292	392	494	592	689	785	881	977	1073	1169	1265	1360	1456	1551

Boiler Structure Standard

Capacity in kg/h.

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	1.1	1.2	1.3	1.4	1.5
20A	26	34	50	66	83	98	114	130	146	162	178	194	209	225	241	257
25A	37	49	71	94	117	140	163	185	208	230	253	275	297	320	342	365
32A	74	96	140	185	230	274	319	363	407	451	495	539	583	627	671	715
40A	96	125	183	242	301	358	416	474	532	589	647	704	762	819	876	934
50A	151	196	287	378	471	560	652	742	832	921	1012	1102	1191	1280	1371	1461

INFO

Please refer to the manufacturer's calculation procedure for nominal size selection.

Ordering Information

When ordering, please specify:

• With or without lever
• Material of the valve body and valve seat
• Set pressure
• Usage (either pressure vessel standard or boiler structure)