Castair 1-1/2"x1-1/2" In-Tank Check Valve NPT Female Fitting Inlet / NPT Male Outlet CTB112112
The Castair CTB112112 is the largest in-tank check valve in Castair's NPT female inlet (CTB) series — a 1-1/2" x 1-1/2" valve rated to 500 PSIG and 400 degrees F with a 1/8" side port for unloader connection. This is a heavy-duty industrial component for large reciprocating compressor installations with 1-1/2" NPT discharge and tank connections. If you're running a large industrial Castair-built compressor and need a factory-correct replacement check valve at this port size, this is the right part.
What This Valve Does
- One-way flow control: Passes compressed air from the compressor discharge into the tank, closes when the compressor unloads to hold tank pressure
- 1/8" unloader port: Connects to the pressure switch unloader to bleed head pressure at shutdown, enabling easy motor restart
- 500 PSIG rated: Significant margin above standard compressor cut-out pressures (100-175 PSI typical), for long-term reliability
- 400 degree F rating: Handles discharge air temperatures without degradation
Technical Specifications
- Part Number: CTB112112
- Inlet Connection: 1-1/2" NPT Female
- Outlet Connection: 1-1/2" NPT Male
- Pressure Rating: 500 PSIG
- Temperature Rating: 400 degrees F
- Unloader Port: 1/8" side port
- Manufacturer: Castair (Spicer, Minnesota)
- Price: Contact us for current pricing
Castair CTB Series Full Lineup
- CTB3812 — 3/8" x 1/2", $21.18
- CTB1212 — 1/2" x 1/2", $20.33
- CTB1234 — 1/2" x 3/4", $29.65
- CTB3434 — 3/4" x 3/4", $31.34
- CTB1010 — 1" x 1", $50.82
- CTB114114 — 1-1/4" x 1-1/4" (call for price)
- CTB112112 — 1-1/2" x 1-1/2" (this listing, call for price)
Why Buy From Air Compressor Factory Direct?
Large-bore check valves at this size are specialty items. We stock the full Castair line and can confirm fitment for your specific compressor configuration. Call us with your compressor model for pricing and availability.
- Free shipping on qualifying orders to the lower 48
- Free tech support — fitment and pricing by phone
- Full manufacturer warranty on all Castair products
Call 866-217-0063 for quick answers and help!
