COAX PRESSURE LIMITING VALVE

Description

PRESSURE BYPASS VALVE – COAX HPB / SPB

Coolant consisting of oils or emulsions is often used in metal machining. By precisely applying the coolant under pressure in a regulated manner in the tool it is ensured that even at maximum cutting speeds the applied coolant achieves the best results on valuable workpieces . Essential to this are reproducible tolerance and measurement accuracy , as well as superior surface finishes of serial production workpieces.

On the other hand, metal shavings are flushed out only with precisely regulated coolant pressure even in knockouts. This guarantees perfect cooling of the tool edges and prevents premature wear of the tools.

Our SPB and (3) HPB series pressure regulating valves guarantee precise pressure regulation regardless of the amount of refrigerant . The need for coolant in the tool fluctuates significantly depending on which machining cycle the tool is in, also in the Tool change cycle, Tool on and off, Feeds, etc. The excess refrigerant returns to the refrigerant reservoir through the valve without any pressure variations being noticed. On the one hand, pressure regulating valves provide the system with a precise refrigerant pressure, and on the other hand, they protect pipes and pumps against damage caused by overpressure through their operating principle. Therefore, the valves in this series are called Pressure Limiting Valves (DBV). Since the valves are incorporated into the return flow of the refrigerant supply, the bypass valves also get hot.

The pressure is regulated on the 3 HPB valves by manual adjustment; in this way only one pressure level can always be chosen. The valves are actuated electropneumatically, the set pressure is switched on and off by means of a voltage supply, eg. ex. with 24 V .

With the voltage on, the pressure regulation is active, with the voltage off the valve is open. With the valve off all the refrigerant reaches the tank; This is called the Minimum Pressure Circulation Circuit. This circulation circuit is always offered in the soft start of the pumps with positive displacement or in the change of tool or part if no coolant is required. As an accessory we offer a two-pressure regulation . This module can be integrated into any valve. Thus the user has the option to alternate between two system pressures .

Bypass valves of the SPB series operate electropneumatically and are controlled by a nominal value signal (eg 0-10 V or 4-20 mA). Thus, the full breadth of the pressure control range can be covered. The use of this type of valve is very useful when the user needs more than two different system pressures.

As an accessory there is an electrical setpoint emitter available (SWG-10 BCD), with which up to seven setpoints can be adjusted if required. SPB valve types are typically used with frequency regulated positive displacement pumps. The valves regulate pressure at high speed and also offer explosion protection . In this system the externally controlled pumps provide the required amount of refrigerant as needed – a very energy efficient combination for the user. The electricity cost of the pump is minimized and the heat input into the refrigerant is greatly reduced. This series is mainly used with the refrigerant media group, consisting of oils or emulsions.

Technical characteristics

PRESSURE BYPASS VALVE – COAX HPB / SPB

Downloads

DESIGNS AVAILABLE – COAX HPB / SPB

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