Type 92–99 overflow regulators – up to 30 bar, DN 50–500
Automatic regulators for maintaining compressor discharge, suction and differential pressures in gas systems.
Selective protection against pressure conditions
Depending on the type, protection against overpressure, underpressure, suction pressure or differential pressure.
Type 92–99 overflow regulators for discharge, suction and differential pressure
The Type 92–99 overflow regulators ensure defined pressure conditions in gas systems. Depending on the version, they limit a compressor discharge pressure, monitor a suction pressure or ensure that the differential pressure between the discharge and suction sides does not exceed or fall below specified limits.
The series is designed for gases in accordance with DVGW Worksheet G 260 as well as non-aggressive gases. Customised special versions are available for other gases. All variants are based on a common basic design comprising a control regulator and an actuator; the respective safety function is determined by the selection, combination and connection of the control regulators.
For technical pre-selection, an inlet pressure of up to 30 bar, control ranges from 0.01 to 30 bar and nominal diameters from DN 50 to DN 500 are available. Larger nominal diameters, special flanges and alternative designs are specified on an application-specific basis.
Up to 30 bar inlet pressure
Up to 30 bar, depending on the model.
Control range 0.01 to 30 bar
Graduated across various control regulators.
DN 50 to DN 500
Larger nominal diameters available on request.
100 mbar minimum pressure differential
20 mbar with enlarged working diaphragm.
Self-acting without external energy
The inlet pressure provides the auxiliary energy.
DIN, ANSI and special flanges
Connections to customer specifications.
Advantages and versions of the Type 92–99 overflow regulators
Safety function tailored to the application
Adaptable to the installation situation
On-site maintenance
Technical data for Type 92–99 pressure relief valves
An overview of the key specifications for the series – from inlet pressure, control range and minimum pressure differential to nominal diameters and connections.
Connections according to customer requirements –
ANSI and special flanges also possible.
Design and operation of Type 92–99 relief regulators
Control regulator and actuator
The relief regulators essentially consist of a control regulator and an actuator. The actuator comprises, amongst other things, a cone valve, a working diaphragm, a balancing diaphragm, a control nozzle and the associated pressure lines. The control regulators are selected to suit the required safety function and pressure range. For operating pressures above 7.5 bar, the series features the RUHH control regulator in combination with the K-type piston valve. Here, a piston replaces the balancing diaphragm and is designed to compensate for high pressure differentials.
How the final pressure safety device works, using the Type 94E as an example
The inlet pressure acts on the cone valve, the compensating diaphragm and the working diaphragm. It also enters the upper diaphragm chamber via the control nozzle. When the compressor starts up, the pressure there rises with a delay. The resulting differential pressure opens the cone valve, ensuring that the machine does not start up against the system’s final pressure. Once pressure equalisation has taken place, the valve closes again.
If the inlet pressure exceeds the value set on the control regulator, its control valve opens. Gas flows out of the upper diaphragm chamber; the differential pressure across the working diaphragm opens the cone valve. The response pressure is set via the handwheel. In the other models, the basic principle is adapted to the respective final pressure, suction pressure or differential pressure requirements by means of different control regulators and pressure connections.
Technical design and enquiries regarding Types 92–99
The following factors are relevant for selecting the appropriate model: the required safety function, the medium, the compressor discharge, suction and differential pressures, the flow rate, the operating temperature, the nominal diameter, the connection type and the installation situation. W2 also takes into account any desired options such as noise attenuation, start-up relief, setpoint adjustment or position indicator.