SUN HYDRAULICS
FRFAKBN

$382.50 USD

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SUN HYDRAULICS
Material:FRFAKBN
Model:FRFA-KBN
Summary:Cartridge

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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 FRFAKBN (Material Number: FRFAKBN) is a bypass-restrictive, fixed-orifice, priority flow control valve designed to manage hydraulic flow with precision and efficiency. This component takes input flow at port 1 and directs it to satisfy the priority flow requirement at port 3. Any excess input flow is bypassed out through port 2, which can be utilized in secondary circuits. The valve requires a specified flow rating from the customer, with factory-set ratings accurate within 10% of the requested setting. It allows for a tuneable adjustment control option that offers up to a 22% variation from the nominal factory preset flow using an adjustment screw. The maximum pressure at port 3 is limited to 3000 psi (210 bar), while both priority and bypass flows can operate up to the system's maximum operating pressure of 5000 psi (350 bar). The sharp-edged orifice design minimizes variations due to viscosity changes, ensuring consistent performance. The valve incorporates Sun's floating style construction, reducing the risk of internal binding due to excessive installation torque or machining variations. With a capacity of 50 gpm (200 L/min) and a maximum input flow capability of 120 gpm (480 L/min), this model is suitable for high-demand hydraulic systems. The valve features a hex size of 1-5/8 inches (41.3 mm) and requires an installation torque between 350-375 lbf-ft (475-508 Nm). Its design includes an internal hex size adjustment screw for fine-tuning and a locknut torque specification of 80-90 lbf-in (9-10 Nm). Weighing in at 2.70 lb (1.25 kg), this model also supports Viton seal kits for enhanced durability in various applications.

Description

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.

Customer must specify a flow rating. Factory set flow ratings are within +/- 10% of the requested setting.
Maximum pressure at port 3 should be limited to 3000 psi (210 bar).
A tuneable adjustment control option provides up to +/- 22% variation from the nominal factory pre-set flow. Adjustment is done with +/- 3 turns of the adjust screw. Screw in (CW) to increase flow.
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.
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.
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-19A
Series	4
Capacity	50 gpm200 L/min.
Maximum Operating Pressure	5000 psi350 bar
Maximum Input Flow	120 gpm480 L/min.
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	2.70 lb1,25 kg
Seal kit - Cartridge	Viton: 990-019-006

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 HYDRAULICSFRFAKBN

SUN HYDRAULICS
FRFAKBN