The Type 14470 check/thermal relief valve has been developed to directly replace with a single unit separate check and thermal relief valves used in wellhead control systems.The principal feature of this valve is its ability to return exhausted fluid caused by thermal expansion downstream internally through the valve itself back to the supply point – thereby eliminating separate exhaust piping.Advantages over conventional valves  Exhaust line piping is totally eliminatedSingle integrated unit eliminates inter-valvepiping |
Removal or disconnection of the valve duringproof testing is not required Pressure differential between B and C caused by thermal expansion downstream of B is exhausted through the relief valve back into the supply at point C. The design of the relief valve is such that variations in pressure at point C caused by the operation of adjacent valves or by leakage have no effect on the setting of the relief valve. Even in the event of the supply pressure falling to zero, the integrity of the relief valve will be retained. |
| Part No. | Pressure range (bar) | Port size | Dim A (mm) | Cv | Proof test pressure (bar) | Cracking pressure (bar) |
Max flow (gals/min) |
| 14470 - 01 |
35 – 345 |
1/4" NPT | 132 | 0.56 | 1,000 | 0.3 | 2 |
| 14470 - 02 | 345 – 700 | 1/4" NPT | 132 | 0.56 | 1,000 | 0.3 | 2 |
| 14470 - 03 |
35 – 345 |
3/8" NPT | 132 | 0.56 | 1,000 | 0.3 | 2 |
| 14470 - 04 | 345 – 700 | 3/8" NPT | 132 | 0.56 | 1,000 | 0.3 | 2 |
| 14470 - 07 |
35 – 345 |
1/2" NPT | 139 | 1.60 |
400 |
0.4 | 6 |
Materials External/wetted parts: 316 stainless steel; check valve seat: Acetal; hardened parts: 431 stainless steel. |