Yoshitake AL-140T is a closed-type safety relief valve designed for applications such as air, cold and hot water, oil, and other non-dangerous fluids. Constructed entirely of stainless steel, it offers exceptional corrosion resistance and durability. The trim parts utilize an FKM soft seat (O-ring) to ensure reliable airtightness, making it highly suitable for environments where valve seat leakage is not tolerated.

Features

• Safety relief valve of all stainless steel made, offering high corrosion resistance and durability in particular.
• Excellent airtightness ensured by the valve seat incorporating soft seat. Most suitable for applications where valve seat leakage is not tolerated.
• Close structure prevents fluid leakage to outside.

Specifications

Model	AL-140T	AL-140T-N
Structure	Closed type	Closed type
Application	Air, Cold and hot water, Oil, Other non-dangerous fluids *	Cold and hot water
Working pressure	0.05-1.0 MPa	0.05-1.0 MPa
Working temperature	5-120°C	5-100°C
Connection	JIS Rc screwed	JIS Rc screwed
Spring case	Stainless steel	Stainless steel
Valve, valve seat	Stainless steel (SCS14A)	Stainless steel (SCS14A)
Adjusting spring	Stainless steel	Stainless steel
O-ring	FKM	FKM

INFO

• Please contact us when using for oil. AL-140TML is recommended for hot and cold water application. Please refer to the chart for set pressure range.

Dimensions and Weights

Nominal size	d	D (mm)	L (mm)	H1 (mm)	H (mm)	Flow area πDℓ (mm²)	Weight (kg)
15A	Rc 1/2	16	34	40	128	20.1	0.7
20A	Rc 3/4	21	38	42	128.5	34.6	0.8
25A	Rc 1	26	43	51	148	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	64	205	135.2	2.8
50A	Rc 2	51	75	76	245.5	208.2	4.7

Structure

No.	Part Name	Material
1	Spring Case	Cast Stainless Steel (SCS14A or SCS13)
2	Valve Seat	Cast Stainless Steel (SCS14A)
3	Valve	Cast Stainless Steel (SCS14A)
4	Valve Cover	Stainless Steel (SUS304)
5	O Ring	FKM
6	C Ring	Stainless Steel (SUS)
7	Spindle	Stainless Steel (SUS303)
8	Spring	Stainless Steel (SUS304)
9	Bottom Spring Plate	Stainless Steel (SUS304 or SUS303)
10	Top Spring Plate	Stainless Steel (SUS304 or SUS303)
11	Adjusting Screw	Stainless Steel (SUS303)
12	Lock Nut	Stainless Steel (SUS303)
13	Cap	Stainless Steel (SUS303)
14	Gasket	PTFE
15	Gasket	PTFE
16	Name Plate	Stainless Steel (SUS304)

Certified Capacity Table

For Air (20°C) (Pressure vessel structure standard, 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
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	479
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

For Water (accumulation: 25%) (Yoshitake standard, m³/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
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	2.7	3.8	6.5	7.9	9.2	10.3	11.3	12.2	13.0	13.8	14.6
50A	4.1	5.9	10.0	12.3	14.2	15.9	17.4	18.8	20.1	21.3	22.4

Installation and Maintenance

WARNING

1. Do not install any closing device such as a stop valve at inlet or outlet sides of the product.
2. Install an exhaust pipe on the outlet side of the product, and lead it to a place where there is no risk of physical damage even if fluid blows out.
3. Do not disassemble the product.
4. When installing, tighten the hexagonal part of the valve seat with a spanner. Do not adjust its direction by rotating the outlet piping.
5. Do not apply viscous fluid that may make fixation of the valve and valve seat.

Daily Inspection

Check the following items while the system is in operation:

• Leakage from between the cap and the O ring.
• Corrosion or crack on the product.
• Leakage from the product under normal working pressure.
• Leakage from the joint between the product and piping, and between the spring case and the valve seat.