Yoshitake AL-4T is a closed-type safety relief valve designed for air, cold and hot water, oil, and other non-dangerous fluids. It is mainly used at the outlet side of pressure reducing valves for alarming, in compact boilers, pressure vessels, or instrumentation machines. The valve parts of the AL-4T utilize polytetrafluoroethylene (PTFE) material, ensuring excellent airtightness of the valve seat.

Features

• Mainly used at the outlet side of PRV for alarming, compact boiler, each pressure vessel or instrumentation machine, etc.
• The valve parts of AL-4T is polytetrafluoroethylene material, the airtightness of valve seat is excellent.

Specifications

AL-4T Specifications

Type	Standard	With SUS trim parts
Structure	Closed type	Closed type
Application	Air, Cold and hot water, Oil, Other non-dangerous fluids	Air, Cold and hot water, Oil, Other non-dangerous fluids
Working pressure	0.05-1.0 MPa *1	0.05-1.5 MPa *1 *2
Maximum temperature	150℃	150℃
Spring case Material	Ductile cast iron	Ductile cast iron
Valve, valve seat Material	Cast bronze (PTFE disc incorporated)	Stainless steel (PTFE disc incorporated)
Connection	JIS 10K FF flanged	JIS 10K FF flanged, JIS 16K FF flanged *3

INFO

*1 Maximum working pressure for 150A is 0.8 MPa (connection: JIS 10K FF flanged). *2 When working pressure is more than 1.2 MPa (for 65A and 80A) or 1.0 MPa (for 100A and 125A), a metal-to-metal seating is incorporated in. *3 JIS 16K FF flanged is used when working pressure is more than 1.0 MPa.

AL-4 Specifications (For Steam)

Structure	Closed type
Application	Steam
Working pressure	0.05-1.5 MPa *1
Maximum temperature	220℃
Spring case Material	Ductile cast iron
Valve, valve seat Material	Stainless steel
Connection	JIS 10K FF flanged, JIS 16K FF flanged *2

INFO

*1 Maximum working pressure for 150A type is 0.8 MPa (connection: JIS 10K FF flanged). *2 JIS 16K FF flanged when working pressure is more than 1.0 MPa.

Dimensions and Weights

AL-4T (JIS 10K)

Nominal size	L (mm)	H1 (mm)	H (mm)	D (mm)	Flow area πDe (mm²)	Weight (kg)
65A	120	120	434	65	331.9	20
80A	130	130	449	75	441.8	22
100A	160	150	597	100	785.4	44
125A	200	205	781	125	1227.2	88
150A	210	215	837	150	1767.2	113

AL-4 (JIS 10K)

Nominal size	L (mm)	H1 (mm)	H (mm)	D (mm)	Flow area πDe (mm²)	Weight (kg)
65A	120	120	432	65	331.9	20
80A	130	130	447	75	441.8	22
100A	160	150	595	100	785.4	44
125A	200	205	779	125	1227.2	88
150A	210	215	835	150	1767.2	113

AL-4 / AL-4T (JIS 16K)

Nominal size	L (mm)	H1 (mm)	H (mm)	D (mm)	Flow area πDe (mm²)
65A	120	120	432 (434)	65	331.9
80A	132	130	449 (451)	75	441.8
100A	162	150	597 (599)	100	785.4
125A	200	205	781 (783)	125	1227.2

INFO

The values in parentheses are the dimensions of the AL-4T.

At the Time of Ordering

When ordering AL-4T, please specify the material of valve and valve seat in addition to the setting pressure.

Certified Capacity Table for AL-4T

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 | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 65A | 422 | 550 | 799 | 1073 | 1347 | 1621 | 1895 | 2169 | 2443 | 2717 | 2991 | 3264 | 3538 | 3812 | 4086 | 4360 | | 80A | 562 | 732 | 1064 | 1428 | 1793 | 2158 | 2522 | 2887 | 3252 | 3616 | 3981 | 4346 | 4710 | 5075 | 5440 | 5804 | | 100A | 999 | 1302 | 1891 | 2540 | 3188 | 3836 | 4484 | 5133 | 5781 | 6429 | 7077 | 7726 | 8374 | 9022 | 9671 | 10319 | | 125A | 1562 | 2035 | 2955 | 3968 | 4981 | 5994 | 7007 | 8020 | 9033 | 10046 | 11059 | 12072 | 13085 | 14098 | 15111 | 16124 | | 150A | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |

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 | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 65A | 4.1 | 5.9 | 8.3 | 10.2 | 11.8 | 13.2 | 14.5 | 15.6 | 16.7 | 17.7 | 18.7 | 19.6 | 20.5 | 21.3 | 22.1 | 22.9 | | 80A | 5.5 | 7.8 | 11.1 | 13.6 | 15.7 | 17.6 | 19.3 | 20.8 | 22.3 | 23.6 | 24.9 | 26.1 | 27.3 | 28.4 | 29.5 | 30.5 | | 100A | 9.9 | 14.0 | 19.8 | 24.2 | 28.0 | 31.3 | 34.3 | 37.0 | 39.6 | 42.0 | 44.3 | 46.4 | 48.5 | 50.5 | 52.4 | 54.2 | | 125A | 15.4 | 21.9 | 30.9 | 37.9 | 43.8 | 48.9 | 53.6 | 57.6 | 61.9 | 65.7 | 69.3 | 72.6 | 75.8 | 78.9 | 81.9 | 84.8 | | 150A | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |

Certified Capacity Table for AL-4

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 | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 65A | 263 | 340 | 493 | 663 | 834 | 1000 | 1165 | 1328 | 1489 | 1651 | 1814 | 1976 | 2138 | 2299 | 2461 | 2621 | | 80A | 350 | 452 | 657 | 882 | 1111 | 1331 | 1550 | 1767 | 1983 | 2198 | 2415 | 2631 | 2846 | 3060 | 3276 | 3489 | | 100A | 622 | 804 | 1168 | 1569 | 1975 | 2367 | 2756 | 3142 | 3525 | 3908 | 4294 | 4677 | 5059 | 5440 | 5825 | 6203 | | 125A | 972 | 1257 | 1826 | 2451 | 3086 | 3699 | 4307 | 4910 | 5508 | 6107 | 6708 | 7309 | 7906 | 8500 | 9102 | 9692 | | 150A | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |