Hydraulic control / practical guide

Hydraulic valve ports: P, T, A and B explained

What do P, T, A and B mean on a Komtes hydraulic directional valve?

P identifies the pressure inlet, T identifies the tank return, and each numbered A/B pair connects to one controlled function. A1/B1 belongs to the first spool, A2/B2 to the second, and so on. Always use the port labels and thread callouts for the selected valve and spool count.

01 / Read the function of each connection

Read the function of each connection

P is the pressure-inlet connection and T is the return connection to the tank circuit. A and B identify the work ports associated with a spool. The numbered pair tells you which controlled function the ports belong to; it does not state the direction in which a connected machine will move.

The machine circuit and the selected spool arrangement determine the required connection and control behaviour. Use the physical port markings, approved circuit and configuration drawing together. A product photograph or simplified 3D view should not be used as the sole reference for hose connections.

02 / Separate spool count from port count

Separate spool count from port count

A three-spool Komtes valve has three numbered A/B work-port pairs. It also has the inlet and return connections shown on its drawing. Calling an assembly “three spools” therefore describes the number of controlled functions, not three total fluid ports.

When preparing an enquiry, specify the number of functions and the intended circuit rather than asking for a valve using an ambiguous total-port count. If the installation needs another connection or a carry-over arrangement, identify that requirement separately for confirmation with Komtes.

03 / Compare the published connection options

Compare the published connection options

The table shows the connection data for the three Komtes platforms. An “or” between sizes indicates options to confirm; it does not mean that different fittings are interchangeable on the same physical port. Check the actual assembly and its drawing before specifying the mating connection.

The KM50 four-spool drawing lists G 3/8–G 1/2 at T. The other six KM50 drawings list G 1/2. This configuration-specific difference is retained in the technical guide and must be confirmed when specifying the return connection for KM50-4.

Published Komtes port callouts · confirm the selected assembly
Valve familyP · Pressure inletT · Tank returnA/B · Work ports
KM50G 3/8 or G 1/2G 1/2 · KM50-4: confirm G 3/8 or G 1/2G 3/8 or G 1/2
KM80G 1/2 or G 3/4G 3/4G 1/2 or G 3/4
KM110G 3/4G 3/4G 3/4

04 / Confirm the complete fitting arrangement

Confirm the complete fitting arrangement

Komtes source drawings use G-thread designations. Confirm the selected thread, sealing arrangement and mating fitting against the physical valve and approved connection specification. A matching nominal size alone does not confirm the sealing interface or the suitability of a replacement fitting.

Thread sizes are also separate from hydraulic performance. They do not establish rated flow, pressure limits or permitted T-port back pressure. Provide the pump flow, required operating conditions and return-circuit details when the technical team confirms the valve configuration.

05 / Work from one identified configuration

Work from one identified configuration

For installation planning, identify the valve family and spool count and use the corresponding dimensional PDF. The product guides link all seven configurations for each family. Keep the selected drawing with the machine circuit so both documents refer to the same connection layout.

Where a port option, control code or circuit requirement is unclear, ask Komtes to confirm it before selecting fittings or finalising the installation. This guide explains the published labels; the selected assembly and agreed machine specification remain the references for the actual connection arrangement.

TECHNICAL REFERENCES

Check the product and its drawing.

Source basis: the published Komtes platform data and dimensional drawings linked below. Each family guide contains the complete one-to-seven-spool configuration matrix. The PDF links here show the three-spool examples.

Confirm the selected configuration and working requirements with Komtes. Published dimensions and connection sizes do not establish operating-pressure, flow or fluid-compatibility limits.

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