SUN HYDRAULICS
FDFALAV

$518.54 USD

SUN HYDRAULICS
Material:FDFALAV
Model:FDFA-LAV
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 FDFALAV (FDFALAV) is a fully adjustable, pressure-compensated flow control valve designed to provide precise flow regulation for both meter-in and meter-out applications, particularly in scenarios with wide pressure fluctuations. This model features a high-capacity check valve that allows unrestricted flow from port 2 to port 1, ensuring efficient operation. The valve is part of the Series 4 range and fits into a T18A cavity. It boasts a capacity of 50 gpm (200 L/min) and can withstand a maximum operating pressure of 5000 psi (350 bar). The balanced adjustment mechanism facilitates easy adjustments even under high pressures, and its sharp-edged orifice design minimizes flow variations caused by changes in fluid viscosity. The FDFALAV model is characterized by its minimal leakage rate of 0.2 gpm (0.8 L/min) when fully shut off. It supports infinite adjustability from nearly closed to maximum flow with up to 5.5 counterclockwise turns from fully closed to fully open position. This valve's installation requires a torque of 350\u2013375 lbf ft (475\u2013508 Nm), with an internal hex size for the adjustment screw at 5/32 inches (4 mm). For secure locking, the locknut hex size is set at 9/16 inches (15 mm), requiring a torque of 80\u201390 lbf in (9\u201310 Nm). Weighing in at approximately 3.30 lbs (1.50 kg), this model also offers compatibility with Viton seal kits for enhanced durability. Designed for systems utilizing phosphate ester fluids, it is important to note that exposure to petroleum-based fluids can damage the EPDM seals within this cartridge model. The Sun Hydraulics FDFALAV provides reliable performance across various applications necessitating precise flow control under fluctuating pressures while maintaining efficiency and ease of use through its innovative design features.

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 HYDRAULICSFDFALAV

SUN HYDRAULICS
FDFALAV