If you have not yet to do with industrial valves, learn some basic terms that ease planning and coordination during the course of the project.

From A to Z

Butterfly Valve

A butterfly valve consists of a body and is for flow regulation. Clamped between flanges.

Centering Aid

Lugs right and left of the operating side shaft outlet of the valve. They ensure easier and more precise installation into a pipeline.


Contact of the valve disk with the body. Possible seals: Striking, swing through, with stop bar and stop bar with seals.


Connection between the actuator and the valve shaft.

Electric Operation

Electric operation of the valve. Control over 4 .. 20 mA-signal possible. Wide ranging optional accessories available.


Element flowing through the valve. (Gas, liquid, etc.)

External Seal

Used at high temperatures to guarantee the turning of the valve at all operating conditions.

Fine Adjustment

Lever which has a free swing variance of 90° and is movable per wing screw or clamp lever into any position.

Fitting Key

Metallic adaption of the shaft to the actuator. This is a side connected metal lug on the shaft. Serves for power transfer from the actuator to the shaft.

Flange Bearing

Serves as transmission of high torques.

Four Cornered Shaft

Serves for the adaption of the shaft to the required connection of the actuator.

Grid Handle

Gear teeth on a nut screwed scale provides the possibility of a gradual adjustment of the valve disk. The catch of the hand lever locks into the teeth. 16 positions between 0 and 90 ° are fixed.

Hand Operation

With grid handle, fine adjustment or worm gear. Depending on installation.

Hydraulic Operation

Operates with a hydraulic cylinder. Special: Good power distribution in limited spaces.


Shows how impermeable the flow is inside the valve. (Dependant on construction, classified in leakage rates).

Inner Sizing

Internal flow area of the valve.

Installation Position

Describes the horizontal or vertical position of the shafts of the valve once installed.

ISO 5211

Norm regulates the attachment measurements for actuators to attachment parts onto valves.

Kv 90°

Flow in a fully open valve disk.

Lever System

It regulates two or more valves with an actuator.

Mounting Kit

Normed part for mounting actuators.

Nominal Size

Size of the inner measurement of the valve.


Operation of the valve. Possible operation: manual, pneumatic- und electric actuators (as standard). All further adaptions available as per customer needs.

Operational Pressure

Pressure in the pipeline which works on the valve.

Operational Temperature

Temperature of the element in the pipeline.

Packing Gasket

Serves as the seal between the valve and shaft exit from the valve body. Can be produced in various ways. (EPDM, PTFE, TA-Luft eg.)

Pneumatic Operation

Opening of the disk in the valve with a pneumatic actuator. With or without a spring setting. Control possible with a positioner.


Infinitely adjustable fine adjustment for larger valves.

Safety Position

This is decided by the customer. Defines the position of the valve in an emergency.


Flexible material in the valve. To improve the impermeability.

Sealing Air

Used to seal the shaft up to 100%.


Defines the regular necessary readjustments (readjustment of the packaging, etc.). For the maintenance plan please see operating and maintenance manual.


Infinitely adjustable fine adjustment with a manual handle, used in smaller valves.

Shaft Bearing

Bears of the shafts in the body.

Slide Bearing

Turned sleeve, e.g. from red brass.


Disk valve fitted in the body of the valve and stops the flow.

Stop bar

Metallic valve stop in the valve. Serves to seal the valve.


Valve without seals between the disk and body with defined ring gap.


German Clean Air Act (§48 BImSchG). Using a TA-Luft packing ensures 100% seal of the shaft bushing to the outside.

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