DIAPHRAGM PRESSURE CONTROL VALVE
DATA SHEET E 760
FDV 30/31, 1.30/1.31, 300/301, 1.300/1.301
FDV 300 KP.51 Z FDV 31 KTZ FDV 300 TTZ
Concept Features Areas of use
The KNF diaphragm pressure valve can be used to keep the system pressure con-
stant, as a pressure relief valve to reduce pressure peaks or in order to prevent the liquid from being sucked directly through the
pump. This accessory can be used in combination with a KNF diaphragm
pump or as an individual product.The FDV pressure valves are suitable for use with liquids and gases. The required pressure can be set by using a spindle/spring combination. This presses down on a diaphragm which is in contact with the liquid or gas.Different material combinations of the wet-ted parts allow the correct solution for every application. Compact and lightweight Pressure control function
Intricate design has resulted in a valve that is both small in size and light in weight. The pressure control valve serves to pro-
duce a constant back pressure. It can be used for a more accurate control of flow against a fluctuating back pressure, metering into a vacuum and from a pres-
surised system. Use with liquid and gaseous media
The careful design of the valve makes them equally suitable for use with both liquids or gases. Bypass function
The bypass valve restricts the build up of excessive pressure on the outlet side of the
pump. If an excessive back pres-
sure occurs, the bypass valve opens and the liquid is re-circulated. The liquid re-
circulates thus protecting the
pump until such time as the restriction is removed. Extreme chemical resistance
The use of chemically resistant materials such as PVDF, PTFE, FFPM or other material combinations in the liquid contact-
ing parts facilitates the pumping of almost all neutral or corrosive media. Durable and maintenance free Anti-injection function
The carefully considered design of these pressure control valves ensures safe oper-
ation and a long life even under the most severe conditions. When pumping into a tube which contains a fast flowing liquid, venturi action can occur. This has a negative effect on the dosing accuracy. With the built-in dia-
phragm pressure control valve the venturi action can be eliminated. Furthermore the pressure control valve function assists the dosing accuracy even though the pipework pressure may vary. Note:
Pressure control valves are not absolutely tight shut off valves. They need to be installed on the pressure side of the
pump.
Performance Data
Type Min. pressure Max. pressure Max. flow rate with Max. flow rate with (bar g) (bar g) liquid (l/min) gas (Nl/min) FDV 30/31 0.5 2.5 3 150 FDV 1.30/1.31 2.0 6.5 3 150 FDV 300/301 0.8 2.5 12 300 FDV 1.300/1.301 2.0 6.5 12 300
