A Low-Leak Proportional Flow Control Family!
Parker Hydraulic ValveSystems Division combines Parker’s precision ground poppet and SuperCoil technology with a newly patented integral compensator design, bringing you a flow control product with best in class repeatability and a truly exceptional level of control.
Parker’s innovative new flow control products are available in both compensated (FAPC) and non-compensated (FAP) series product families. The FAP series offers repeatable and accurate operation throughout the full control range of the valve. In conditions of varying load, the FAPC series maintains predictable and repeatable performance through the introduction of our new fully integrated compensator.
Built directly into the FAPC series valves, the innovative new compensator maintains a
tight seal for load holding without any requirement for additional sealing. When open, the compensator responds to changing load conditions independently. With no seal friction to overcome, the FAPC valve maintains the repeatable and predictable performance customers can rely on. This additional feature eliminates the need for complex programming algorithms, and any requirement for an external compensator to improve the operator’s control.
Features & Benefits
The new FAP and FAPC family is a natural fit in lifting and lowering applications where holding the load and controlling movement leaves little margin for error. The fully compensated FAPC is rated to flows up to 115 LPM (22 GPM); while the non-compensated FAP is capable of flows up to 120 LPM (28 GPM). High flow capability doesn’t come at the expense of critical control on the low end of the flow range.
Repeatable Control
Programming the FAP and FAPC is easy due to a more linear flow curve in relation to input current. This linearity combined with low internal hysteresis allows for more repeatable performance and lower variability from valve to valve.
Superior Metering
An added benefit of the smooth linear flow curve is precision control in low flow requirements, where control accuracy matters most. Less internal friction and more predictable control give the FAP and FAPC products “outstanding control, right out of the box.”
Modular Solution
Multi-functional by design the FAP and FAPC pack more features into a single cavity. Proportional control when open, low leak load holding when desired with pressure compensation available for conditions of varying load.
FAP Valves
- Excellent metering capability and control throughout the full flow range
- Reduced drift
- Low leak control (less than 5 dpm)
- Modular solution to applied problem
- Improved control throughout the control range
FAPC Valves
- Excellent metering capability and control throughout the full flow range
- Reduced drift
- Low leak control (less than 5 dpm)
- Modular solution to applied problem
- Low leak compensator, requiring no additional seals, results in very low hysterisis (< 10%)
- Maintains constant flow regardless of load condition
- Patented Integrated low leak compensator
For more more information, please see the FAP and FAPC product in the Proportional Valve section of our catalog HY15-3503R1 or by emailing us at HCS.Technical@support.parker.com.
FAP - How It Works
The FAP utilizes a control current to proportionally raise and lower a poppet creating a variable orifice allowing flow to pass through from the inlet to the outlet.
FAP At Rest
No pressure is present at the cartridge.
The armature spring pushes the pilot against the poppet and the poppet against the seat, holding the valve closed.
FAP Pressure Applied
When pressure is applied to the inlet port, the poppet is against the seat as it is when no pressure is available at rest.
FAP Current Applied
As current is applied to the coil, the armature moves proportionally to the current applied. This lifts the pilot off the poppet.
The poppet then follows the displacement of the pilot and lifts off the seat.
FAPC - How It Works
The FAPC utilizes a control current to proportionally raise and lower a poppet creating a variable orifice allowing flow to pass through from the inlet to the outlet. There is also a low leak integral compensator that responds to load changes in the hydraulic circuit by varying the outlet orifice, metering the flow rate that can be passed through and maintaining constant flow independent of load conditions.
FAPC At Rest
No pressure present at the cartridge. The armature spring pushes the pilot against the poppet and the poppet against the seat, holding the valve closed.
The compensator spring pushes the compensator spool to the open position.
FAPC Pressure Applied
When pressure is applied to the inlet port, the poppet is against the seat as it is when no pressure is available at rest.
Pressure at the inlet is also communicated to port 1 through an internal passage. The pressure pushes the piston against the seat to prevent leakage from the inlet to the outlet, preventing actuator movement.
FAPC Current Applied
As current is applied to the coil, the armature moves proportionally to the current applied. This lifts the pilot off the poppet. The poppet then follows the displacement of the pilot and lifts off the seat.
The compensator moves to maintain a constant pressure drop across the poppet and seat which maintains a constant flow rate regardless of inlet pressure changes.
Application Examples
Poppet type proportional valves can be configured in a bridge circuit arrangement to create virtually any proportional spool condition. The valve timing can be individually controlled to provide decompression, cushion start or stop, or cylinder regeneration functions. Electronic feedback based on cylinder position or load pressure can be used to control cylinder position, speed, or to control the drop out of regeneration function.
Normally closed FAPC used as a proportional lift and lower control. The low leak compensator and spherical poppet act to hold the load in the closed position. The valve is shifted proportionally to control lift or lower speed.
FAP and Logic valves used as a proportional compensated flow control with by-pass. Priority flow is proportionally controlled by the FAP across the compensator. When the priority flow rate is met, the valve allows additional flow available from the pump to by-pass to another function.
FAPC normally closed used in combination with load control valves for header height or suspension control. Holds suspended load at set height over rough terrain.
Markets
- Lift Trucks
- Aerial Work Platforms
- Scissor Lift Utility
- Harvesting Combines
- Vehicle Suspensions
....are just some of the applications where the FAP/FAPC series valves can be used!
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