Cant figure out the valves on my vacuum casting machine : r

0391006 WATTS LF009M2QT 1-1/2 RPZ BACKFLOW PREVENTER

0063235 WATTS LF007M1QT 2IN D/C BACKFLOW PREVENTER

Manual - Peppas Ltd Combustion - energy controls

Paid $950 per head for Edelbrock heads and had to change the springs. No lapping on valves : r/Justrolledintotheshop

85716 IPS W4702HA WATERTITE WMOB W/WATER HAMMER ARRESTORS PEX CONNECTION

Materials Used in Die Casting

V.I.C. 12 Casting Machine Maintenance

Pressure valves type MV.., DMV.. and SV.. - EUROFLUID

0556031 WATTS LFN36M1 3/4 VACUUM RELIEF VALVE #Q532527