SUN HYDRAULICS
FDFAHAV

$534.43 USD

SUN HYDRAULICS
Material:FDFAHAV
Model:FDFA-HAV
Summary:Cartridge

Quantity in stock: 0

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***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Sun Hydraulics directly.***
The Sun Hydraulics FDFAHAV (FDFAHAV) is a fully adjustable, pressure-compensated flow control valve with reverse flow check capabilities, designed for precise flow regulation in meter-in or meter-out applications. This model is engineered to handle wide pressure fluctuations while maintaining consistent performance. The FDFAHAV valve is infinitely adjustable from nearly closed to its maximum flow capacity, ensuring versatile application across various scenarios. An integral high-capacity check valve allows for unrestricted flow from port 2 to port 1, enhancing its operational flexibility. This two-port flow control cartridge is interchangeable with others of the same frame size in terms of flow path and cavity, although the extension dimensions may differ. The FDFAHAV features a balanced adjustment mechanism that facilitates easy adjustments even under high-pressure conditions. Its sharp-edged orifice design minimizes variations in flow due to changes in fluid viscosity, maintaining accuracy and reliability. With a cavity size of T18A and a series designation of 4, this model has an impressive capacity of up to 50 gpm (200 L/min) and can operate at a maximum pressure of 5000 psi (350 bar). The adjustment mechanism allows for up to 5.5 counterclockwise turns from fully closed to fully open positions. The valve's hex size measures 1 5/8 inches (41.3 mm), and it requires an installation torque between 350-375 lbf ft (475-508 Nm). Additionally, the locknut hex size is 9/16 inches (15 mm), with a torque specification of 80-90 lbf in (9-10 Nm). The FDFAHAV model weighs approximately 3.30 lb (1.50 kg) and includes Viton seals suitable for systems using phosphate ester fluids; however, exposure to petroleum-based fluids should be avoided as it may damage the seals.

Description

Fully adjustable, pressure-compensated flow controls with reverse-flow check provide precise flow regulation for meter-in or meter-out applications where there may be wide pressure fluctuations. They are infinitely adjustable from nearly closed up to the maximum flow. An integral high-capacity check valve provides unrestricted flow from port 2 to port 1.

All 2-port flow control cartridges are physically and functionally interchangeable (i.e. same flow path, same cavity for a given frame size). However, cartridge extension dimensions from the mounting surface may vary.
A balanced adjustment mechanism allows for easy adjustment even at high pressures.
The sharp-edged orifice design minimizes flow variations due to viscosity changes.
Minimum leakage is .2 gpm (0,8 L/min) when the adjustment mechanism is turned to the shut-off position.
Cartridges with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage the seals.

Cavity	T-18A
Series	4
Capacity	50 gpm200 L/min.
Maximum Operating Pressure	5000 psi350 bar
Adjustment - Number of Counterclockwise Turns - Fully Closed to Fully Open	55
Valve Hex Size	1 5/8 in.41,3 mm
Valve Installation Torque	350 - 375 lbf ft475 - 508 Nm
Adjustment Screw Internal Hex Size	5/32 in.4 mm
Locknut Hex Size	9/16 in.15 mm
Locknut Torque	80 - 90 lbf in.9 - 10 Nm
Model Weight	3.30 lb1,50 kg
Seal kit - Cartridge	Viton: 990-018-006

Show FAQ

What happens if I block the bypass port on a priority flow control?	The valve acts as a 2 port restrictive flow control.
How big is a drop of hydraulic oil?	There are exactly 250 Sun drops in a cubic inch or 15 in a cc.
How accurate are Sun's flow controls?	We claim +/- 10%. We set to +/- 5% in production testing to allow for differences in customers' conditions. If you want accuracy, stay in the bottom 2/3rds of the range. Our 12 gpm (45 L/min.) flow controls are quite flat at 9 gpm (34 L/min.) and dead flat below 6 gpm (23 L/min.), until you get to the bottom of the range. Below about .25 gpm (1 L/min.), spool leakage and orifice conditions start to limit accuracy.
I have a heat problem, will Sun's priority flow control help?	I am afraid not. Unless you are overflowing your current valve and correctly size ours, you are not likely to notice any improvement. Priority flow controls are not efficient devices. They are an easy way to get more than 1 source of oil from 1 pump but they can generate a lot of heat. Try to size your actuators so the pressures are similar on both the priority and the bypass circuits. If you can't do that, try to have the lower flow leg be the lower pressure. The pump pressure is determined by whichever leg is higher and if there is flow that is taking a pressure drop that is not doing work it is creating heat.
What happens if I block the control flow (priority) port?	All flow is blocked, hence the term priority. The priority flow has to be satisfied.
What is the compensating pressure of Sun's flow controls?	The spring force in our flow controls equates to about 100 psi (7 bar). This is high enough to give the valves acceptable capacity (not really) and not too high for proper circuit operation. 100 psi (7 bar) is the spring force; at the upper end of the flow control's range, the drop through the valve will be as high as 250 psi (17 bar) before it starts modulating.
What is the pressure drop through a flow control?	In a meter-in flow control circuit if the pump is set at 3000 psi and the load is 2000 psi the drop through the flow control is 1000 psi. In a meter-out circuit with the load at 2000 psi the drop through the flow control is 2000 psi.

SUN HYDRAULICSFDFAHAV

SUN HYDRAULICS
FDFAHAV