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Non-return valves

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article image Suitable for cost-sensitive applications involving aggressive gaseous or liquid media.

PARKER Instrumentation, represented by Victoria Fittings & Valves , has released series non-return valves optimised for cost-sensitive fluid instrumentation applications. The Hi-Check valves employ a high-integrity two-piece body with minimal leakage paths and accommodate pressures up to 689 bar.

The valves combine a high flow rate capability with a low pressure drop. They are available with a wide choice of connections, body and seal materials to suit a range of media. They are suitable for both fluid and gaseous applications and are useful for panel builders and OEMs seeking robust, low-cost check valve solutions for oil and gas, chemical, pulp and paper, power generation and other industrial applications.

Hi-Check non-return valves (NRVs) are available fabricated from 316 stainless steel, Duplex or Monel in a choice of 1/4-inch, 3/8-inch and 1/2-inch A-LOK (twin ferrule) or CPI (single ferrule) compression tube fitting connections, or female NPT threads. The compression tube fitting equipped variants are also available in 6mm, 10mm and 12mm sizes. This choice of connection options allows users to choose the optimum solution for reduced installation time and cost. The valve's body design also helps maximise integrity by preventing any contact between the connector thread and the media.

The ability to specify the valve with integral compression tube fittings instead of taper threads means that users can achieve high integrity connections without any need for thread sealants. The mating ends of the valve body are fitted with an environmental seal to help prevent corrosion from external agents.

Standard Hi-Check NRVs are suitable for Class 2500 operation, with a cold working pressure (CWP) rating of 414 bar. Class 4500 Hi-Check valves are available, accommodating up to 689 bar. Both versions have a 4:1 pressure boundary safety factor, are hydrostatically tested in the factory to 1.5 times maximum working pressure, and are designed to meet the pressure and temperature requirements of ANSI/ASME B.16.34 as defined by the valve seal materials.

Class 2500 NRVs offer a choice of four different seal materials: fluorocarbon, nitrile, ethylene propylene rubber (EPR) and highly fluorinated fluorocarbon rubber, spanning working temperatures from -57°C to +204°C. The Class 4500 valves are available with fluorocarbon or fluorinated fluorocarbon rubber seals, accommodating working temperatures from -26°C to 204°C.

All Hi-Check NRVs employ O-ring sealing to ensure leak-tight shut-off within the flow path, and have a cracking pressure of less than 0.69 bar. They also have a low reseal pressure and are guaranteed to close bubble-tight before the upstream pressure reaches 3.45 bar. The valve mechanism employs a high-reliability self-centring seal and zero coil bounding check spring, both of which are field replaceable. It is designed for low noise operation.

Parker Hi-Check NRVs are supported by HCT (heat code traceable) certificates to show material composition and origin, and can be supplied fabricated from NACE MR 01 75/ISO 15156b compliant materials. Special O-rings to guard against explosive decompression in high-pressure applications are also available.

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