When fluid is required in the direction of flow, the diaphragm opens allowing full flow. As the flow through the valve stops, the diaphragm closes preventing any return flow. The greater the back or head pressure, the better the diaphragm seals against the valve seat.

Choosing the correct foot valve

Use the following flow chart and technical specifications to determine the correct Foot Valve for your requirements

Foot Valve selection instructions

Step 1: Measure or calculate the capacity of your pump installation.

Step 2: Look at the chart for the valve(s) that cover the flow rate.

Step 3: For dirty water applications choose the largest valve that will be operating in the area shown by the thicker line.

Example: If your pumping capacity is 400 l/min use a FV32 Foot Valve

Maximum Head Pressure: @ 20°C
VALVE	FV25	FV32	FV40	FV50	FV63
psi	235	235	235	235	235
Bar	16	16	16	16	16
kPa	1600	1600	1600	1600	1600

Vacuum required for initial flow:
VALVE	FV25	FV32	FV40	FV50	FV63
psi	-0.5	-0.5	-0.5	-0.5	-0.5
kPa	-3.5	-3.5	-3.5	-3.5	-3.5

Vacuum required to fully open diaphragm:
VALVE	FV25	FV32	FV40	FV50	FV63
psi	-1.5	-1.5	-1.5	-1.5	-1.5
kPa	-10.0	-10.0	-10.0	-10.0	-10.0

Minimum flow for self cleaning action:
VALVE	FV25	FV32	FV40	FV50	FV63
l/min	110	210	300	460	600

Connection: female BSPT
VALVE	FV25	FV32	FV40	FV50	FV63
Thread Size	1"	1 1/4"	1 1/2"	2"	2 1/2"

Dimensions: (mm)
VALVE	FV25	FV32	FV40	FV50	FV63
Diameter	69	87	99	123	152
length	72	88	99	120	157

Installation: Valve will operate at any angle.
Head Loss: See chart above.

Maximum operating temperature: 60°C ( Degrees Celsius)
Note: All references to gallons are in imperial gallons

Hansen foot valves
Used on the end of a suction line to stop the fluids in the line emptying when the pump is turned off. This eliminates the need to prime your pump each time you start it.

Valve Operation

Choosing the correct foot valve

Maximum Head Pressure: @ 20°C

Vacuum required for initial flow:

Vacuum required to fully open diaphragm:

Minimum flow for self cleaning action:

Connection: female BSPT

Dimensions: (mm)

Hansen foot valves Used on the end of a suction line to stop the fluids in the line emptying when the pump is turned off. This eliminates the need to prime your pump each time you start it.

Valve Operation

Choosing the correct foot valve

Maximum Head Pressure: @ 20°C

Vacuum required for initial flow:

Vacuum required to fully open diaphragm:

Minimum flow for self cleaning action:

Connection: female BSPT

Dimensions: (mm)

Hansen foot valves
Used on the end of a suction line to stop the fluids in the line emptying when the pump is turned off. This eliminates the need to prime your pump each time you start it.