Type 86 vacuum regulator for suction pressure systems
Opens when the suction pressure falls below a defined level and protects upstream tanks and compressors from excessive vacuum.
Reliably limiting suction pressure
The regulator opens at the set limit and prevents any further drop in pressure.
Safeguarding suction pressure in compressor systems
The Type 86 vacuum regulator prevents the suction pressure from falling below a set limit. During the start-up of an open suction system, it opens as soon as the set limit is reached. In this way, the regulator counteracts any further drop in pressure and protects upstream tanks or compressors from excessive strain.
The Type 86 is designed for air. Other gases are available on request. The regulator operates automatically and requires no external power for its basic function.
Various control ranges, nominal diameters and connection types are available to suit the technical requirements. DIN, ANSI and special flanges allow adaptation to the system. Documented variants and options are available for low pressure differentials, higher temperatures, noise reduction or start-up relief.
From a pressure differential of 100 mbar
20 mbar with a larger working diaphragm.
Nominal diameters DN 80–300
Other nominal diameters available on request.
–15 to +130 °C
H version up to +250 °C.
Flexible flange connections
DIN, ANSI and special flanges.
No external power supply required
Self-acting mechanical control principle.
Flexible installation orientation
Main unit in any position; control regulator vertical.
Advantages and versions of the Type 86 vacuum regulator
High control accuracy with a short response time
Maintenance directly at the installation site
Options for start-up and noise reduction
Technical data for the Type 86 vacuum regulator
An overview of the key specifications for the Type 86 – from minimum pressure differential and control range to nominal diameters, temperature and connections.
Other nominal diameters available on request.
Connections according to customer requirements – ANSI and special flanges also possible.
How the Type 86 vacuum regulator works
Control regulator, diaphragms and ball valve
The Type 86 combines the DUH control regulator with a diaphragm-controlled actuator. The key components include the working and balancing diaphragms, hollow stem, control nozzle, control lines, setpoint spring and ball valve. The balancing diaphragm ensures a pressure-balanced valve actuator mechanism. The suction pressure is fed via the hollow spindle and the control line into the diaphragm chambers and to the control diaphragm of the control regulator.
The main unit can be installed in various orientations. The control regulator itself is always positioned vertically, regardless of the main unit’s orientation. The control lines and the presetting of the switching points are carried out at the factory.
How the Type 86 works
When a compressor is started up, the operating suction pressure is established in the upstream system. This pressure acts continuously on the control diaphragm of the DUH regulator. When the vacuum reaches the limit value set by the setpoint spring, the control valve opens. As a result, atmospheric pressure is applied to the upper diaphragm chamber after a short time.
The resulting pressure difference across the working diaphragm moves the actuator and opens the ball valve against the force of the closing spring. This prevents the suction pressure from falling any further. The setting is adjusted using the control regulator’s hand knob; turning it anti-clockwise increases the vacuum setpoint. The filter’s intake opening must be protected against clogging materials during operation
Technical specification and enquiry regarding the Type 86 vacuum regulator
The following factors are particularly relevant for selection and design: the desired suction pressure or operating range, the required pressure differential, the medium and temperature, the required suction volume or flow rate, the nominal diameter, the flange connection and the installation configuration. Please also specify whether an enlarged working diaphragm, the H version, noise attenuation or start-up relief is required.