Yoshitake AL-32ML is a closed type safety relief valve with a lever. It is used mainly in various pressure vessels, instrumentation devices, and at the outlet of pressure reducing valves to prevent accidents caused by abnormal pressure rise. All stainless steel construction (SCS14A and SUS316 for trim parts) offers high corrosion resistance. The closed structure prevents fluid leakage, and a discharge inspection can be manually performed using the lever.

Features

• Lever type safety valve allows manual discharge inspection.
• All stainless steel construction (SCS14A and SUS316 for trim parts) for high corrosion resistance.
• Closed structure prevents fluid leakage.

Specifications

Structure	Closed type with lever
Application	Air, water, oil, other non-dangerous fluid *
Working pressure	0.05-1.0 MPa
Working temperature	5-120°C
Connection	JIS 10K loose flange

* Please contact us when using for oil.

WARNING

1. Do not apply the AL-32ML to devices which do not allow any valve seat leakage. It has allowable valve seat leakage and does not close completely.
2. Do not use the product for equipment or devices which vibrate excessively.
3. Do not adjust or change the set pressure.

Dimensions and Weights

Nominal size	Dimension D (mm)	Dimension L (mm)	Dimension H1 (mm)	Dimension H (mm)	Flow area (mm²)	Weight (kg)
15A	16	63	97	215	20.1	2.5
20A	21	87	101	217	34.6	2.9
25A	26	92	119	245	53.0	4.5
32A	33	99	135	284	93.3	5.3
40A	41	109	140	321	135.2	6.7
50A	51	114	162	372	208.2	11.5

The outlet flange is 1 size larger than the nominal size.

Structure

No.	Part name
1	Spring case
2	Valve seat
3	Valve
4	O-ring
5	Spindle
6	Spring
7	Bottom spring plate
8	Top spring plate
9	Adjusting screw
10	Lock nut
11	Cap
12	Gasket
13	Gasket
14	Name plate
15	Lever
16	Spring pin
17	O ring
18	Connecting rod
19	Spring pin
20	Pressure groove

Nominal Size Selection

For Air (at 20°C)

Capacity <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	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

For Water (at 20°C, accumulation: 25%)

Capacity <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

Operation

Blowout Operation

As the inlet pressure approaches the blowout pressure, the force of fluid pushing up the valve approaches the force of the spring pressing down the valve. The safety relief valve commences to blow when the inlet pressure reaches around 3% below the blowout pressure. The fluid accumulates gradually on the pressure groove and when the fluid pressure reaches the blowout pressure the valve pops.

Closing Operation

Since the inlet pressure of the safety relief valve decreases when the fluid is released into the atmosphere by the pop action of the valve, the force of fluid lift is lowered. At this point, the repelling force of the spring becomes larger than the force of fluid lift and thus the valve closes. In addition, while the safety relief valve discharges, pressure of fluid entering into the back of the valve (back pressure) adds to the closing force.

Installation

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, do not loose the screw of the spring case and the valve seat.
5. Do not apply viscous fluid that may make fixation of the valve and valve seat.

Pipe Mount

1. Pipe mount should have sufficient strength and rigidity against stress which are induced by reaction force in opposite direction of the exhaust through the axis of the exhaust pipe.
2. Install the product vertically as close as possible to the can body and the header to prevent pressure loss.
3. Inner diameter of pipe mount shall be more than that of the product inlet.

Exhaust Pipe

1. Install exhaust pipe and drip pan elbow so that the product can not be subject to the stress caused by thermal expansion of equipment and by dilatation of the exhaust pipe.
2. Inner diameter of exhaust pipe shall be more than that of the product outlet to avoid improper back pressure.

Inspection

Daily Inspection

Check the following items while the system is in operation:

• Corrosion or crack on the product.
• Leakage from the product under normal working pressure.
• Leakage from joints between the product and piping.

Monthly Inspection

Check that there is no loose piping at the inlet and outlet side of the product and that the cap is fastened securely. For the AL-32ML, check the operation by lifting up the lever, while differential pressure between the set and inlet pressures is within the allowed range.

Required differential pressure at a discharge inspection

Nominal size	Difference between set pressure at a discharge inspection
15A-25A	1.0 MPa or less
32A, 40A	0.6 MPa or less
50A	0.4 MPa or less