SUN HYDRAULICS
FVDALAV

$152.30 USD

SUN HYDRAULICS
Material:FVDALAV
Model:FVDA-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 FVDALAV (FVDALAV) is a ventable, bypass-restrictive, fixed-orifice priority flow control valve designed to manage hydraulic flow efficiently. This model directs input flow from port 1 to satisfy the priority flow at port 3, with any excess being diverted through port 2 for secondary circuit use. The valve also features a vent port at port 4 for remote control, allowing users to adjust pressure at the priority port. It is crucial that the maximum pressure at port 3 does not exceed 3000 psi (210 bar), although both priority and bypass flows can handle system operating pressures. The valve maintains consistent priority flow regardless of input fluctuations and only provides bypass flow once priority requirements are met unless the valve is vented. This model incorporates a sharp-edged orifice design to minimize variations caused by viscosity changes and includes a tuneable adjustment control option offering a variation of up to \u00b125% from the factory preset flow. Adjustments are made via an internal hex screw, allowing for precision tuning within three turns. The Sun floating style construction reduces risks of internal part binding due to excessive installation torque or machining variations. Key specifications include a cavity size of T-22A, series number 2, with a capacity of up to 12 gpm (45 L/min) and maximum operating pressure of 5000 psi (350 bar). The maximum input flow is rated at 30 gpm (120 L/min), while nominal vent flow is set at 46 in\u00b3/min (0.75 L/min). Additional specifications include a valve hex size of 1-1/8 inches (28.6 mm) and installation torque requirements between 45-50 lbf-ft (61-68 Nm). The adjustment screw has an internal hex size of 5/32 inches (4 mm), with locknut torque set at 80-90 lbf-in (9-10 Nm). The model weighs approximately .40 lb (.20 kg) and utilizes Viton seal kits for optimal performance.

Description

Ventable, bypass/restrictive, fixed-orifice, priority flow controls take an input flow at port 1 and use it to satisfy the priority flow at port 3. If the input flow exceeds the priority flow requirement, the excess is bypassed out port 2. The bypass flow may be used in a secondary circuit. A vent port (port 4) allows these valves to be controlled remotely.

Customer must specify a flow rating. Factory set flow ratings are within +/- 10% of the requested setting.
Using a pressure control on port 4 will limit the pressure at the priority port (port 3). If pressure on the bypass port (port 2) exceeds the setting of the pressure control, priority flow will be shut off and all the flow will go out the bypass port.
Maximum pressure at port 3 should be limited to 3000 psi (210 bar).
Both priority and bypass flow are usable up to the system operating pressure.
Priority remains relatively constant regardless of variation in input flow.
Bypass flow is not available until priority flow requirements are satisfied, except when the valve is vented. When port 4 (vent) is open, all flow diverts to port 2 if pressure at port 1 (inlet) is 150 psi (10,5 bar) or higher.
Pressure at the bypass port (port 2) may exceed pressure at the priority port (port 3).
The sharp-edged orifice design minimizes flow variations due to viscosity changes.
A tuneable adjustment control option provides up to +/- 25% variation from the nominal factory pre-set flow. Adjustment is done with +/- 3 turns of the adjust screw. Screw in (CW) to increase flow.
Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations.

Cavity	T-22A
Series	2
Capacity	12 gpm45 L/min.
Maximum Operating Pressure	5000 psi350 bar
Nominal Vent Flow	46 in³/min.0,75 L/min.
Maximum Input Flow	30 gpm120 L/min.
Valve Hex Size	1 1/8 in.28,6 mm
Valve Installation Torque	45 - 50 lbf ft61 - 68 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	.40 lb0,20 kg
Seal kit - Cartridge	Viton: 990-022-006

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 HYDRAULICSFVDALAV

SUN HYDRAULICS
FVDALAV