Structure; Operation - Yoshitake AL-6 Product Manual

Blowout operation
As inlet pressure of the product rises and approaches opening pressure, the force of fluid pushing up the
valve [5] approaches the force of the spring [12] pressing down the valve [5], and then the product
commences to blow. The fluid starts to leak by the simmering and accumulates gradually on the pressure
groove. When the fluid pressure reaches the specified opening pressure the valve [5] 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 [5], the force of fluid lift is lowered. At this point, the repelling
force of the spring [12] becomes larger than the force of fluid lift and thus the valve closes. In addition,
since the safety relief valve blows, the pressure of fluid entering into the back of the valve [5] (back
pressure) adds to the closing force.

3. Structure

Fig.2 Structure

4. Operation

3
No. Part name
1 Body
2 Spring case
3 Cap
4 Valve seat
5 Valve
6 Spindle
7 Guide plate
8 Spindle guide
9 Spring plate
10 Adjusting screw
11 Lock nut
12 Spring
14 Lever
15 Stud bolt & nut
16 Pin
17 Nut
18 Bolt
19 Plug
20 Name Plate
21 Gasket
22 Split pin
23 Spindle Ring
24 Rivet
■EPDT-241■