Type 14470
Integrated check/thermal relief valve




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 eliminated

Single integrated unit eliminates inter-valve piping

Removal or disconnection of the valve during proof
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.

This relief valve conforms to Directive 94/9/EC relating to equipment intended for use in potentially explosive atmospheres and is ATEX (ATmosphere EXplosible) certified.

These valves also conform to the Pressure Equipment Directive 97/23/EC. All valves are CE marked and supplied with a test certificate plus a declaration of conformity.
Marshalsea Hydraulics has been assessed by SGS Société Générale de Surveillance SA and certified as meeting the requirements of ISO 9001:2000 for the design, development, manufacture and servicing of hydraulic pumps, relief valves and intensifiers.

Part number 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
14470 – 08 345 – 700 1/2" NPT 132 0.56 1,000 0.3 2
Materials

External/ wetted parts
 316 stainless steel

Hardened parts
 431 stainless steel

Other parts
 stainless steel