Mechanical flow switch and indicator for water with internal thread

VDO

Mechanical flow switch and indicator for water lines with G 1/4 to G 3 internal thread, DN 8 to DN 80 sizes, 2-600 l/min H2O switching ranges, adjustable Reed contact and rotating local display.

Introduction

Flow monitoring is easier when the switching function and local indication sit in one compact device. This mechanical flow switch and indicator monitors water lines while showing flow status on site, without pressure- or media-loaded glass parts.
 
Flow lifts a magnet-equipped piston from the valve seat against spring force. The piston actuates both a hermetically separated Reed switch and a hermetically separated indicator ring. Threaded versions cover DN 8 to DN 80 with G 1/4 to G 3 internal connections, H2O switching ranges from 2-600 l/min and recommended Qmax. values up to 720 l/min. Pressure resistance reaches PN 100 bar for smaller sizes, depending on the connection.
 
The short installation length supports compact pipework, while precise, stepless switching value adjustment helps set the switching point for the application. Standard mounting uses horizontal flow, supported by 5 x DN straight calming sections in the inlet and outlet. Optional ingress protection (IP65), temperature indication, temperature monitoring and oil switching ranges allow closer adaptation.

Monitor and display
Monitor and display
Combines Reed switch output with a hermetically separated indicator ring.
No loaded glass parts
No loaded glass parts
Design avoids pressure- and media-loaded glass parts in the flow path.
Compact pipe fit
Compact pipe fit
Short installation length supports threaded mounting from DN 8 to DN 80.
Broad flow coverage
Broad flow coverage
H2O switching ranges cover 2-600 l/min, with Qmax. values up to 720 l/min.

Features

Piston switching principle

Flow lifts a magnet-equipped piston against spring force and actuates a hermetically separated Reed switch.

Local indication

The piston also actuates a hermetically separated indicator ring. The display can be rotated.

Internal thread connection

The product family uses G internal threads from G 1/4 to G 3 for nominal widths from DN 8 to DN 80.

Pressure classes

Pressure resistance depends on size: PN 100 for G 1/4 to G 1/2, PN 25 for G 3/4 to G 1 and PN 16 for G 1 1/4 to G 3.

Electrical connection

The standard connection uses a DIN 43650-A / ISO 4400 plug and a changeover Reed switch.

Installation position

Horizontal flow is the standard arrangement. Other installation positions are possible, but they affect the switching point or switching range.

Setpoint adjustment

The switching point is adjusted by loosening the switch head fixing screw and rotating the switch head.

Configuration options

Options include special connectors, signal lamps, ingress protection (IP65), temperature indication, temperature monitoring, metal cover and stainless steel housing.