Parker E2B020ZNLoad Control Valve Parker offers an extensive line of standard load and motor control valves which are typically referred to as counterbalance valves. Multiple options are available for pressures as high as 6000 PSI (420 Bar) and flows up to 90 GPM (350 LPM.)Parker’s CB101, MHC-010-S, MHC-022-S, and E2 series of counterbalance valves are all standard non-vented load and motor control valves. Each series has multiple pilot ratio options, adjustment styles, and available pressure ranges. They can also be supplied with fixed factory settings, or with tamper proof caps. Typically higher pilot ratios are used for simple load holding applications where the moving load is controlled by external means and the main purpose of the counterbalance is to hold the load in position when not being operated, and to provide thermal and hose-break protection. Lower pilot ratios are typically used to assist in applications where cylinder or motor speed and positioning needs to be controlled with varying loads. Parker’s extensive line of counterbalance load and motor control valves allow design flexibility in the most demanding applications and markets including and not limited to: Power Units, Refuse, Oil and Gas, Material Handling, Construction, Drills, Presses, Mixers, Agriculture, Balers, Combines, Load Holding, Hose Break Protection, Overrunning load control. Technical Information Maximum Flow Rate: 5.3 GAL/MIN, 20 L/MIN Pilot Pressure Ratio: 4.5:1 Adjustment Mechanism: Screw Mounting Type: Threaded Cartridge Valve Holding Pressure: 3120 PSI, 215 BAR Pressure Control Range: 725-6000 PSI, 50-420 BAR Port Size: N/A Seal Material: Nitrile Division: Mobile Systems Division Europe Maximum Flow Rate: 5.3 Gal/min, 20 L/min Pilot Pressure Ratio: 4.5:1 Adjustment Mechanism: Screw, Screw Adjustment Mounting Type: Threaded Cartridge Valve Holding Pressure: 3120 psi, 215 bar Pressure Control Range: 725-6000 psi, 50-420 bar Port Size: N/A Seal Material: Nitrile Flow Rate: 5.3 Gal/min, 20 L/min Maximum Operating Pressure: 6000 psi, 420 bar Port Thread Size: N/A Maximum Inlet Pressure Rating: 6000 psi, 420 bar Pressure Control Sensitivity: 1640 per turn psi, 113 per turn bar Operating Temperature: -30° to +250° °F, -34° to +121° °C, -30 to +250 °F, -34 to +121 °C Function: Counterbalance Valve Actuation Type: Pilot Operated Pilot Location: External Body Material: N/A Maximum Kinematic Viscosity: Mineral-based or synthetic with lubricating properties at viscosities of 45-2000 SSU (6 to 420 cSt) cSt, 45-2000 SSU (6 to 420 cSt) Flow Direction: Cylinder port 1, Valve port 2, Pilot port 3 Filter Efficiency Rating: ISO 4406:1999 Code 18/16/13, ISO 4406 18/16/13, SAE Class 4 Leak Rate: 6 @ 1450 PSI (100 BAR) drops/min Cavity Size: 53-1 Installation Torque: 30 Nm, 22 lb-ft For Fluid Type: Mineral-based or synthetic hydraulic fluids Valve Material: All parts steel. All operating parts hardened steel Maximum Operating Temperature: +250 °F, +121 °C Minimum Operating Temperature: -30 °F, -34 °C Weight: 0.17 lb, 0.08 kg Counterbalance valves are devices used to control cylinder and motor loads helping to restrict overrunning loads, assist with controlling speed and position for varying loads, and they are also used as load holding devices with built in thermal relieving functionality. Standard counterbalance valves are pilot operated devices that allow free flow in one direction and restricted flow in the opposite direction. The load is held in place until the counterbalance setting is overcome by sufficient pressure generated by the pump, thermal expansion, or from external forces acting on the actuator. Once the pressure falls below the required setting, the valve closes and holds the load in place. In order to save horsepower, pilot pressure assists in the opening of the valve allowing the load to be controlled with a lower than load induced pressure as long as the available pilot pressure is greater than the ratio between the valve setting and the selectable pilot ratio. Standard counterbalance valves are non-vented meaning the control spring chamber is connected to the valve outlet which will cause any downstream pressure to be additive the valves pressure setting. If excessive downstream pressure may be present or if the counterbalance pressure setting is critical, Parker also offers several series of externally vented counterbalance valves. Parker’s CB101, MHC-010-S, MHC-022-S, and E2 series of counterbalance valves are all standard non-vented load and motor control valves. Each series has multiple pilot ratio options, adjustment styles, and available pressure ranges. They can also be supplied with fixed factory settings, or with tamper proof caps. Typically higher pilot ratios are used for simple load holding applications where the moving load is controlled by external means and the main purpose of the counterbalance is to hold the load in position when not being operated, and to provide thermal and hose-break protection. Lower pilot ratios are typically used to assist in applications where cylinder or motor speed and positioning needs to be controlled with varying loads. Parker’s extensive line of counterbalance load and motor control valves allow design flexibility in the most demanding applications and markets including and not limited to: Power Units, Refuse, Oil and Gas, Material Handling, Construction, Drills, Presses, Mixers, Agriculture, Balers, Combines, Load Holding, Hose Break Protection, Overrunning load control. Can't Find A Part? Ask us!We specialise in sourcing hard to find specials, oddballs & obsolete parts, get in touch if you can't see what you are looking for.01555 [email protected] The purchaser of these items must ensure that they are satisfactory for use in the application for which they are intended.No responsibility can be accepted if any products are incorrectly or inadequately fitted. Goods may not be exact to image shown.
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