Start with the fail state. If power cuts out, what should happen next? Normally closed valves stop flow until power opens them, which is why they show up so often in safety-minded systems. Normally open valves do the opposite: flow continues until power shifts the valve (great for purge, ventilation, or other hydraulic solenoid valve applications).

Material choice should match the media, pressure, temperature, and environment. It often comes down to:

- Brass for many general-duty fluid and air systems - Stainless steel for harsher or corrosive conditions - Aluminum when lower weight matters and compatibility is confirmed

Before ordering, confirm a few details:

- Coil voltage and electrical type - Port size, valve configuration, and pressure rating - Brand, series, and any visible part number or identification on the hydraulic solenoid valve assembly

It’s smart to ask when the part number is unclear, the old valve has been modified, or the system involves unusual pressure, media, or electrical requirements. The same goes for buyers comparing a Parker Skinner valves to hydraulic solenoid valves from another line. G&G can help sort through the specs before a wrong order slows the job down.