The Lined Pipe Insert (LP) spring check valve is designed to mate between two flanges on most lined pipe systems. It provides the simplest most economical way to install a check valve in a lined piping system. No gaskets are required; just spread the flanges, center the valve and bolt the flanges together. LP valves are available in fluoropolymer (PTFE/FEP/PFA) and Alloy C-276 to satisfy the most demanding applications. The standard spring material is Alloy C-276. Other materials are available upon request.
| Nominal Pipe Size | Size Code | A | B | C | D** | O.D. | Orifice Dia.** |
| 1 | H | 0.590 | 1/4 | 0.26 | 0.26 | 0.53 | 0.348 |
| 1-1/2 | J | 1.120 | 1/4 | 0.46 | 0.42 | 0.78 | 0.593 |
| 2 | K | 1.570 | 1/4 | 0.79 | 0.44 | 1.01 | 1.135 |
| 3 | M | 2.520 | 5/16 | 0.77 | 0.66 | 1.43 | 1.555*** |
| Body Material | Nominal Pipe Size | Non-Shock Pressure-Temperature Rating |
| Alloy C-276 (HC) | 1" - 3 " | ANSI Class 150/300 |
| PTFE (TF) | 1" - 2 " | 55 PSIG @ 100 °F |
| 2 | 20 PSIG @ 100 °F |
| Size | Cv |
| 1 | 2.4 |
| 1-1/2 | 6.1 |
| 2 | 18.8 |
| 3 | 32.0 |
| SIZE | PART NUMBER | METAL | PTFE |
| 1 | LPH | 4.0 oz. | 1.0 oz. |
| 1-1/2 | LPJ | 8.8 oz. | 2.2 oz. |
| 2 | LPK | 14.4 oz. | 3.2 oz. |
| 3 | LPM | 2.3 lb. | 9.0 oz. |
| Valve Style | Size Range | Body Materials
| Allowable Seat Materials | Standard Cracking Pressures | Standard Spring Material |
| LP | 1" - 3" | PTFE | AFLAS®
EPDM
"Metal to Metal" Buna-N
Kalrez®
Neoprene
Viton® | 1/2 PSI | 316 SS |
| LP | 1" - 3" | Alloy C-276 | AFLAS®
Buna-N
EPDM
Kalrez®
"Metal to Metal"
Neoprene
PTFE
Viton® | 1/2 PSI | 316 SS |
For additional information about Check Valves
What is a Silent Check Valve?
What is a Spring Loaded Check Valve?
What is a Poppet Check Valve?
What is an Inline Check Valves?
