Pipeline ancillaries Disc, split disc and wafer check valves
10
Pressure loss diagram
Pressure loss diagram with open valve at 20 °C. The values indicated are applicable to spring loaded valves with horizontal flow. With vertical flow, insignificant deviations occur only within the range of partial opening. The curves given in the chart are valid for water at 20 °C. To determine the pressure for other fluids the equivalent water volume flowrate must be calculated and used in the graph.
w = 1000 x
Where:
w = Equivalent water volume flow in l/s or m ³ /h = Density of fluid kg/m ³ = Volume of fluid l/s or m ³ /h
Pressure loss information for steam, compressed air and gases is available from Spirax Sarco.
Pressure loss in bar
How to order Example: 1 off Spirax Sarco DN50, DCV1 bronze disc check valve for fitting between EN 1092 PN25 flanges.
* * Note: Flanges, bolts (or studs), nuts and joint gaskets are to be provided by the installer. Disc check valves are non-maintainable (no spares are available). Disc check valves are not suitable for use where heavily pulsating flow exists, such as close to a compressor. Various options are denoted by a marking on the valve body: 'W' – Without spring – Standard metal disc 'H' – Heavy duty spring – Standard metal disc 'V' – Standard spring – Viton soft faced disc 'E' – Standard spring – EPDM soft faced disc 'WV' – Without spring – Viton soft faced disc 'WE' – Without spring – EPDM soft faced disc 'HV' – Heavy duty spring – Viton soft faced disc 'HE' – Heavy duty spring – EPDM soft faced disc 'T' – Valves tested to EN 12266-1 Rate D No identification indicates a standard spring with a metal disc. * Safety information, installation and maintenance For full details see the Installation and Maintenance Instructions (IM-S19-04-EN-ISS1) supplied with the product. DCV disc check valves must be fitted in accordance with the direction of flow arrow indicating correct fluid flow direction. When fitted with a spring they can be installed in any plane. When supplied without a spring they must be fitted in a vertical flow line with the flow from bottom-to-top. The 'cam' design of the body allows the various flange types to be accommodated. The body is rotated to touch the flange joint bolts ensuring that the valve is centred in the pipeline. Disposal If a product which contains a Viton component has been subjected to a temperature approaching 315 °C or higher, then it may have decomposed and formed hydrofluoric acid. Avoid skin contact and inhalation of any fumes as the acid will cause deep skin burns and damage to the respiratory system. Viton must be disposed of in a recognised manner as stated in the Installation and Maintenance Instructions (IM-S19-04-EN-ISS1). No other ecological hazard is anticipated with the disposal of this product providing due care is taken.
7.5.5
10.5 8
TI-P134-05 CMGT Issue 11
Page 4 of 4
DCV1 Disc Check Valve
Powered by FlippingBook