Yoshitake AL-24F is a full bore, lift type safety relief valve with a closed, dash-pot structure designed for high-pressure gas testing applications. It features a leak-free diaphragm design and is operated via a handle type adjusting screw. The AL-24F is suited for cold and hot water, oil, and other non-dangerous fluids, operating at temperatures up to 120°C. The related AL-24 model operates up to 60°C for cold and hot water.

Features

1. No need to worry about rust by made of bronze for valve case and stainless steel for valve seat. Operation is reliable since the valve is diaphragm type with no sliding part.
2. Wide set pressure range is available by only one spring. Changing set pressure is easy, because the adjusting screw is handle type and lock nut is butterfly nut.
3. Opening and closing are smooth even when the valve operates continuously, and surely relief the fluid at set pressure. Also it can operate stably from small to large flow rate.
4. Valve materials can be selected from EPDM or FKM (fluororubber) depending on the specification.
5. Can be connected in any direction (horizontal or vertical).

Specifications

Model	AL-24	AL-24F
Application	Cold and hot water	Cold and hot water, Oil, Other non-dangerous fluids
Working pressure	0.1-0.7 MPa *1	0.1-0.7 MPa *1
Maximum temperature	60℃	120℃
Valve case material	Bronze *2	Bronze *2
Valve material	NBR	FKM
Valve seat material	Stainless steel	Stainless steel
Diaphragm material	EPDM	FKM
Connection	JIS Rc screwed	JIS Rc screwed

INFO

*1 Available with working pressure between 0.05 MPa and 0.1 MPa. *2 Available with NPb-treated.

Dimensions and Weights

Nominal size	d	L (mm)	L1 (mm)	H (mm)	H1 (mm)	D (mm)	Weight (kg)
15A	Rc 1/2	180.5	20.5	91	46	15	1.4
20A	Rc 3/4	181.5	18.5	92	47	15	1.4
25A	Rc 1	187.5	17.5	97	52	18.2	1.6

Certified Capacity Table for AL-24, 24F

Set pressure range 0.1 to 0.7 MPa (accumulation 25%)

Discharge capacity (m³/h)

Nominal size	0.10 MPa	0.15 MPa	0.20 MPa	0.25 MPa	0.30 MPa	0.35 MPa	0.40 MPa	0.45 MPa	0.50 MPa	0.55 MPa	0.60 MPa	0.65 MPa	0.70 MPa
15A	0.31	0.38	0.44	0.49	0.54	0.58	0.63	0.66	0.70	0.73	0.77	0.80	0.83
20A	0.31	0.38	0.44	0.49	0.54	0.58	0.63	0.66	0.70	0.73	0.77	0.80	0.83
25A	0.46	0.56	0.65	0.73	0.80	0.86	0.92	0.98	1.03	1.08	1.13	1.18	1.22

Set pressure range 0.05 to 0.1 MPa (accumulation 25%)

Discharge capacity (m³/h)

Nominal size	0.05 MPa	0.06 MPa	0.07 MPa	0.08 MPa	0.09 MPa	0.10 MPa
15A	1.27	1.39	1.50	1.61	1.70	1.80
20A	1.27	1.39	1.50	1.61	1.70	1.80
25A	1.87	2.05	2.21	2.37	2.51	2.65

Calculation Formula

V = (A * K * 12.4) / √(G / P)

• V: Discharge capacity (m³/h)
• D: Seat diameter (mm)
• e: Lift (mm)
  • 0.1-0.7 MPa: e = D/40
  • 0.05-0.1 MPa: e = D/7
• A: Effective area (m²) (A = π * D * e)
• K: 0.7 (Flow rate coefficient)
• G: Specific gravity
• P: Opening pressure (MPa)

TIP

Viscosity is calculated from the formula for viscosity correction.

Structure and Parts

No.	Part Name	Material
15	Wing Nut	Steel
14	Adjusting Screw	Steel
13	Bolt	Steel
12	Spring Cover	Cast Iron (FC200)
11	Spring Plate	Carbon Steel (SPC)
10	Spring	Piano Wire (SWP)
9	Nut	Brass (C3604)
8	Spring Washer	Steel
7	Diaphragm Shell	Carbon Steel (SPC)