Yoshitake AL-400TL is a closed-type lever safety relief valve typically used on the outlet side of pressure reducing valves or small pressure vessels. Designed for air, water, oil, and other non-dangerous fluids, it features a ductile cast iron (FCD450) body with stainless steel and PTFE trim. The valve operates within a pressure range of 0.05 to 1.3 MPa and a maximum temperature of 120°C, providing a reliable discharge mechanism when predetermined opening pressures are reached.

Features

• Lever type safety relief valve.
• Closed type structure that does not allow blown fluid to be discharged to the outside except at the outlet.
• Typically used on the outlet side of pressure reducing valves or small pressure vessels.
• Trim: stainless steel and PTFE.

Specifications

Model	AL-400L	AL-400TL
Structure	Open type with lever	Closed type with lever
Application fluid	Steam	Air, water, oil and other non-dangerous fluids
Maximum pressure	0.05~1.6 MPa	0.05~1.3 MPa
Maximum temperature	220°C	120°C
Connection	JIS 10K FF flanged / JIS 16K FF flanged*	JIS 10K FF flanged / JIS 16K FF flanged*
Valve case, spring case	Ductile cast iron (FCD450)	Ductile cast iron (FCD450)
Valve, valve seat	Stainless steel	Stainless steel • PTFE

*JIS 16K FF flanges are used when the applicable pressure exceeds 1.0 MPa.

WARNING

(1) Do not use this product for equipment or devices that do not allow valve seat leakage. This product has valve seat leakage within the allowable value and cannot be completely closed. (2) This product cannot be used for equipment or devices that generate excessive vibration. (3) The set pressure cannot be adjusted (changed). (4) For applicable fluids, adhesive fluids that can cause the bonding of the valve and valve seat cannot be used.

Dimensions and Weights

Nominal size	L (mm)	H1 (mm)	H (mm)	Weight (kg)
15A	90	108	282	5.4
20A	90	108	282	5.7
25A	90	108	282	6.9
32A	91	115	325	9.6
40A	91	115	325	9.8
50A	105	132	351	13.6

Certified Capacity Table for AL-400TL

For air (20℃) (Pressure vessel structure standard)

Unit: 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
15A	84	109	159	213	268	322	377	432	486	541	595	650	704	759
20A	84	109	159	213	268	322	377	432	786	541	595	650	704	759
25A	84	109	159	213	268	322	377	432	486	541	595	650	704	759
32A	136	178	259	347	436	525	614	703	792	880	969	1058	1147	1236
40A	136	178	259	347	436	525	614	703	792	880	969	1058	1147	1236
50A	249	325	473	635	797	959	1121	1283	1445	1607	1769	1932	2094	2256

For water (accumulation: 25%) (Yoshitake standard)

Unit: 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	1.1	1.2	1.3
15A	0.8	1.1	1.6	2.0	2.3	2.6	2.8	3.1	3.3	3.5	3.7	3.9	4.0	4.2
20A	0.8	1.1	1.6	2.0	2.3	2.6	2.8	3.1	3.3	3.5	3.7	3.9	4.0	4.2
25A	0.8	1.1	1.6	2.0	2.3	2.6	2.8	3.1	3.3	3.5	3.7	3.9	4.0	4.2
32A	1.3	1.9	2.7	3.3	3.8	4.2	4.7	5.5	5.4	5.7	6.0	6.3	6.6	6.9
40A	1.3	1.9	2.7	3.3	3.8	4.2	4.7	5.5	5.4	5.7	6.0	6.3	6.6	6.9
50A	2.4	3.5	4.9	6.0	7.0	7.8	8.5	9.2	9.9	10.5	11.0	11.6	12.1	12.6

Structure

No.	Name of Parts	Material
1	Spring Case	Ductile Cast Iron (FCD450)
2	Body	Ductile Cast Iron (FCD450)
3	Valve Seat	Stainless Steel (SUS304)
4	Valve / Valve · P	Stainless Steel & PTFE (SUS304 & PTFE etc)
7	Spring	Piano Wire or Steel Wire
8	Cap	Bronze (CAC406)
14	Name Plate	Aluminium
17	Lever	Stainless Steel (SUS430)

Operation

1. Initial closed state

When the pressure at the inlet side of the safety relief valve is lower than the opening pressure, the valve / valve · P are held down by spring force and the valve is closed.

2. Discharge

When the pressure on the inlet side increases and approaches the opening pressure, the force of the fluid trying to push up the valve approaches the force holding it down, causing it to start discharging. This gradual buildup of pressure in the pressure groove causes a vigorous popping operation when the predetermined opening pressure is reached.

3. Closing

When the valve is popped and fluid is released, the pressure on the inlet side decreases, and the force of the spring prevails, closing the valve.

Installation

DANGER

• Do not install any closing device such as a stop valve at the inlet or outlet side.
• Connect a discharge pipe and a drain pipe to the outlet side of the product, and lead it to a place where there is no risk of physical damage even if the fluid blows out.

TIP

• The product should be installed in a vertical position with the cap facing upward.
• The internal diameters of the mounting pipe stand and discharge pipe should be equal to or greater than the inlet and outlet diameters, respectively.

Maintenance

Daily Inspection

• External Leakage: There should be no external leakage of internal fluid.
• Valve Leakage: There should be no leakage from the outlet side of the safety relief valve at the normal pressure.

Periodic Inspection (Once per month)

Increase the fluid pressure to 75% or more of the set pressure, lift the lever, and confirm that discharge occurs.

Lever Lifting Procedure:

1. Position the lever perpendicular to the pin.
2. Lift the lever to initiate the discharge operation.