13 - PV - Proportional Valves
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Member of the Donfoss Group Proportional Valves

rnwn^"y E Proportional Valves Catalog Quick Reference Member of the Danfoss Group Proportional Directional Model No. Cavity Description Proportional Directional Proportional Directional Model No. Cavity Description Proportional Directional Pressure Page Proportional Directional Model No. Cavity Description Proportional Directional Pressure Page * Flow ratings are based on a pressure drop of 7 bar [100 psi] unless otherwise noted. They are for comparison purposes only.

Proportional Valves Catalog Quick Reference Description Proportional Flow Control Valve, NonCompensated, Normally Closed, Poppet Type Flow* 55 l/min 14 US gal/min 70 l/min 18 US gal/min 90 l/min 24 US gal/min Flow* 12 l/min 3 US gal/min 45 l/min 12 US gal/min 100 l/min 26 US gal/min 100 l/min 26 US gal/min Flow* 45 l/min 12 US gal/min 70 l/min 18 US gal/min 80 l/min 21 US gal/min Description Proportional Flow Control Valve, Pressure Compensated, Restrictive Type, Normally Closed Flow* 30 l/min 8 US gal/min 65 l/min 17 US gal/min 90 l/min 24 US gal/min Description Proportional Flow Control...

Proportional Valves Catalog Quick Reference Proportional Flow Controls Proportional Pressure Reducing Description Proportional FLow Divider, Compensated, Catalog HIC Proportional Pressure Reducing Description Proportional Pressure Reducing/Relieving Valve, Piloted, Normally Closed Proportional Pressure Reducing Description Proportional Pressure Reducing Valve, Direct Acting, Normally Open Proportional Flow Controls Proportional Valves Quick Reference 1 Description Proportional Flow Control Valve, Pressure Compensated, Priority Type, Normally Closed Description Proportional Flow Control...

Proportional Valves Catalog Quick Reference Cavity SDC10-4 Description Proportional Pressure Reducing/Relieving Valve, Piloted, Normally Open Proportional Pressure Reducing Description Proportional Pressure Reducing/Relieving Valve, Piloted, Normally Open Proportional Pressure Relieving Proportional Pressure Relieving Proportional Pressure Relieving Flow* 25 l/min 7 US gal/min Flow* 25 l/min 7 US gal/min Description Proportional Pressure Reducing Valve, Direct Acting, Normally Open Flow* 5 l/min 1 US gal/min 8 l/min 2 US gal/min Description Proportional Relief Valve, Pilot Operated,...

Proportional Valves Catalog Application Notes PROPORTIONAL VALVES Proportional, or electro-proportional valves, provide infinitely variable control of flow, pressure, or direction, in response to a electric input signal. There are four basic types of Comatrol proportional valves: • • • • Flow control valves. Pressure reducing/relieving valves. Pressure relief valves. Directional control valves Proportional valves Proportional Valves Application Notes PLUS+1™ COMPLIANT Comatrol solenoid valves are PLUS+1™ compliant. PLUS+1 compliance means our valves are directly compatible with the PLUS+1...

Proportional Valves Catalog Application Notes PROPORTIONAL FLOW CONTROL VALVES Comatrol proportional flow control valves are 2-way, spool-type valves that are directly operated with a proportional electromagnetic solenoid actuator. By controlling electric current, these valves create an infinitely variable orifice. Proportional flow control valve 1. A constant pressure differential is maintained across the proportional valve (variable orifice), which maintains constant flow regardless of changes in operating pressure or load. Typical flow versus pressure drop 2. A constant pressure...

Proportional Valves Catalog Application Notes PROPORTIONAL PRESSURE REDUCING/ RELIEVING VALVES Proportional pressure reducing/relieving valves are 3-way valves that provide a controlled output pressure as a function of electric current, regardless of system pressure or flow (within the valve’s limits). Direct acting designs are available for low-flow applications. Direct-acting, proportional, pressure reducing valve Proportional pressure reducing valves have a variety of applications including: • Proportional Valves Application Notes Single acting cylinder position control, e.g. combine...

Proportional Valves Catalog Application Notes Proportional pressure relief valves are 2-way valves that provide a relief pressure as a function of electric current. Both normally-open (increasing pressure with increasing current), and normallyclosed (decreasing pressure with increasing current) are available. Normally closed versus normally open proportional relief valves Normally-Open Normally-Closed PROPORTIONAL PRESSURE RELIEF VALVES The normally-open proportional relief valve is a direct-acting design for low flow applications. High flow normallyopen proportional relief valve functions...

Proportional Valves Catalog Application Notes PROPORTIONAL PRESSURE RELIEF VALVES (continued) Normally-closed proportional relief valves are available in direct-acting and pilotoperated designs. A direct-acting, normally-closed proportional relief valve is used for low flow applications. For high flow applications, internally pilot-operated cartridges are available. Internally pilot-operated cartridge for high flow applications Common applications for normallyclosed proportional relief valves are: Proportional Valves Application Notes Cooling fan speed control in hydrostatic fan drive...

Proportional Valves Catalog Application Notes Compensator is a hydraulic component that maintains a constant pressure drop across a fixed or variable orifice. Current is the flow of electricity through a conductor or coil, normally measured in amps (A). Steady-state current flow in an electrical circuit can be calculated by Ohm’s Law, as well as voltage and resistance. Ohm’s Law Current Control is a feature of almost all valve drivers. The output of analog proportional valves is a direct function of current. If a valve is controlled with voltage, higher solenoid temperatures, which increase...

Proportional Valves Catalog Application Notes TERMS AND DEFINITIONS (continued) PWM is an acronym for Pulse-Width-Modulation. Most valve drivers use a current controlled PWM which produces an average output that is a function of duty cycle in order to reduce valve hysteresis and to allow current control without excessive heat generation. A typical PWM output is a square wave from 80-500 Hz. Ramping is the application of current to a solenoid with a linear or non-linear ramp, rather than an instantaneous step. Ramping current on and off to a proportional valve provides actuators with...