Tilting Disc Check – Sizing and Pressure Drop

Valve Sizing

The chart below allows you to size a tilting disc check valve to give a specific pressure drop against a given flow rate of water. However, for air, steam, gases or other liquids you should consult our Sales Office for the sizing of Tilting Disc Check Valves.

Northvale Korting has invested in computer-aided design facilities and, to this extent, we can size valves for your applications and give accurate predictions of pressure drops etc. As such we require the following information:

Preferred units shown
FLUID
LIQUID
GAS
STEAM
NAME   
FLOWRATE
m3/hr
kg/hr
kg/hr
INLET PRESSURE
bar g
bar g
bar g
PRESSURE DROP MAX.
bar
bar
bar
TEMPERATURE
°C
°C
°C
SG
water=1
air=1
-
VALVE ORIENTATION
LINE SIZE
mm
mm
mm

Oversize Tilting Disc Check Valves

Oversized tilting disc check valves should not be used as this causes the disc to flutter and will quickly wear out the spindle bearings.

The lines a to d on the graph below represent the point at which the check valve attains its fully open position and therefore its correct sizing for its relative installation orientation.

a. Horizontal line with spring
b. Vertical line with spring
c. Horizontal line without spring
d. Vertical line without spring

Leakage Rate

The Tilting Disc Check Valve, when supplied, has an intended maximum leakage rate through the body/disc seating area of 1cm3per minute irrespective of valve size. This meets the requirements laid down for this test under API 598 and ANSI B16.34/MSS SP-61.

Conversions  
1 m water guage appoximately equal to3.28feet water guage
 1.42psi
 0.098bar
1 m3/hr water appoximately equal to0.28litres/sec
 3.66igpm
 0.59ft3/min

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