SUN HYDRAULICS
FRDCOIV

$136.71 USD

SUN HYDRAULICS
Material:FRDCOIV
Model:FRDC-OIV
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 FRDCOIV (FRDCOIV) is a specialized flow control valve designed to operate exclusively in bypass mode. This modification of the FRDA valve enhances system stability by ensuring that if the bypass pressure surpasses the priority port pressure, the priority flow ceases to be pressure compensated. Users can specify a desired flow rating, with factory settings accurate within 10% of this specification. The valve features a sharp-edged orifice design that minimizes flow variations due to changes in fluid viscosity and includes an adjustable control option allowing for up to a 25% variation from the nominal preset flow via an adjustment screw. The FRDCOIV utilizes Sun's floating style construction, reducing the risk of internal binding due to installation torque or machining variations. It fits into a T-2A cavity and belongs to Series 2 with a capacity of 12 gpm (45 L/min). The maximum operating pressure is rated at 5000 psi (350 bar), with an input flow limit of 30 gpm (120 L/min). The valve\u2019s hex size measures 1-1/8 inches (28.6 mm), and it should be installed with a torque between 45-50 lbf-ft (61-68 Nm). The adjustment screw has an internal hex size of 5/32 inches (4 mm), while the locknut requires a torque of 80-90 lbf-in (9-10 Nm). This valve weighs approximately .40 lb (.20 kg) and comes with Viton seals as part of its cartridge kit, identified by seal kit number 990202006. It's important for users to note that blocking either the bypass port or control flow priority port significantly alters its function, transforming it into a restrictive flow control or completely blocking all flow, respectively.

Description

This valve is a modification of an FRDA. It controls flow in the bypass mode only. If the bypass pressure exceeds the pressure at the priority port the priority flow will no longer be pressure compensated. This modification was done in an attempt to improve system stability in specific cases.

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).
Bypass flow is not available until priority flow requirements are satisfied.
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-2A
Series	2
Capacity	12 gpm45 L/min.
Maximum Operating Pressure	5000 psi350 bar
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: 990-202-006

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 HYDRAULICSFRDCOIV

SUN HYDRAULICS
FRDCOIV