Frequently Asked Questions

How do I choose between direct-acting and pilot-operated?

Choose direct-acting for zero differential or low flow. The coil lifts the plunger against line pressure, allowing it to function in both vacuum and gravity-fed circuits.
Pilot-operated normally closed solenoid valves are for when you want higher CV and larger ports with modest power draw. It needs a small pressure differential to open and is well-suited to steady systems.

Which species do you need to quote the right valve for?

A short list avoids mismatches. Share:
- Media and temperature range (water, air, steam, chemicals).
- Min/max pressure and required flow or Cv.
- Port size and thread type (¼, ⅜, ½ NPT).
- Body and seal materials (brass, 303 SS; EPDM, FKM, PTFE).
- Coil voltage and connection (120/60, 24/60 VAC, 12 VDC; DIN or ½ conduit).

Can your normally closed solenoid valves handle steam or gas service?

Yes – if the particular model of normally closed 2-way solenoid valve is steam or gas rated. Look for stainless or brass bodies with PTFE or EPDM seals, proper orifice, and pressure/temperature listings. Many Parker Gold Ring options carry steam ratings (some at 125 psi). For longevity, add a strainer and mount the coil upright to help condensate drain.

Common installation mistakes to avoid:

Most failures trace to setup, not the valve itself. We’ve seen it:
- No upstream strainer; debris holds the plunger off-seat.
- Reversed flow; follow the body arrow.
- An undersized orifice causes a pressure drop and heat.
- Wrong duty cycle; coils overheat when normally closed solenoid valves are energized continuously without rating.

What coil voltages and connectors are available – and how fast can they ship?

Standard coils include 120/60 VAC, 24/60 VAC, and 12 VDC. Connect via DIN plug or ½ conduit with 18-inch leads. Stock varies: common -¾ NPT brass valves often ship quickly, while stainless or steam packages may require a lead time. Share your part number and we'll confirm same-day availability.