1/2 in. Inline Female x Female PVC Spring-Loaded Check Valve
1/2 in. Inline Female x Female PVC Spring-Loaded Check Valve
Sizes in This Series
PVC Female x Female Threaded Spring Check Valves, 1/2 in. through 1-1/4 in. Jump to another size or add it straight to your cart:
| Size | Part # | Price | Cart |
| 1/2 in. (this page) | 940331 | $14.99 | — |
| 3/4 in. | 940332 | $16.99 | Add to cart |
| 1-1/4 in. | 940334 | $29.99 | Add to cart |
Overview
Midland Industries 940331 is a 1/2 in. PVC inline spring check valve with FPT x FPT (female NPT) threaded ends. Thread it onto schedule PVC or compatible pipe; no solvent weld required. The spring-loaded poppet opens under forward flow and seals on reverse flow, rated to 200 psi at 77 °F.
Technical Specifications
| Manufacturer | Midland Industries |
| Part Number (MPN) | 940331 |
| Nominal Size | 1/2 in. |
| End Connections | FPT x FPT (Female NPT) |
| Valve Type | Inline Spring Check |
| Pressure Rating | 200 psi |
| Temperature Range | 77 °F |
| Body Material | PVC |
| Lead Content | Not specified by manufacturer |
Materials of Construction
| Body | PVC |
| Internals | Spring-loaded poppet |
Typical Applications
Used in irrigation, pool, pond, and water lines where a threaded, serviceable check valve is preferred over a glued one. Forward flow opens the spring poppet; reverse flow seats it. Install with the flow arrow downstream and seal threads with PTFE tape.
Cross-Reference and Interchange
This valve cross-references to these competitor and industry part numbers: 0209CV40G, 42034-08, 523T03 . Replacing one of these? Match nominal size, end connections, and the rating for a direct fit, or send us your part number and we will confirm the interchange.
Sizing and Installation Resources
- Check Valve Types Explained
- PVC Valve Chemical Compatibility Chart
- Valve Pressure & Temperature Ratings Chart
- How to Choose the Right Valve
- Teflon Tape vs. Pipe Dope
Frequently Asked Questions
Q: How does this valve connect?
A: FPT x FPT female NPT threads; no glue required.
Q: What is the pressure rating?
A: 200 psi at 77 °F.
Q: Should I use thread sealant?
A: Yes, use PTFE tape or pipe dope rated for plastic threads.
Q: Which way does it install?
A: Follow the flow arrow on the body so forward flow opens the poppet.
California Proposition 65 Warning: This product can expose you to chemicals including Chloroethane, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.