SUN HYDRAULICS
FMDBMAV4A12V

$557.85 USD

SUN HYDRAULICS
Material:FMDBMAV4A12V
Model:FMDB-MAV@4A12V
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 FMDBMAV4A12V (FMDBMAV4A12V) is a sophisticated 3-way, meter-in, electro-proportional throttle valve designed for precise fluid control in hydraulic systems. When unenergized, the valve blocks the supply at port 1 and connects port 2 to the tank at port 3. Upon energization, the coil applies a closing force on the spool to create a metering orifice from port 1 to port 2 that is proportional to the coil command current. This feature allows for self-compensating flow control in the 1 to 2 direction, with optional pressure compensation using an external modulating logic element. The flow from port 2 to port 3 is not proportional. The transition between positions is closed, and using two of these valves can create a four-way configuration, allowing selection from existing flow ranges without needing custom spools. The valve supports pressure compensation through external elements like LRCXHN for bypass circuits or LPCXHN for restrictive circuits. It offers some self-compensation and can be used as a flow control device; however, accuracy can be enhanced with an external modulating logic element over various flows and pressures. All ports are rated for up to 5000 psi (350 bar), and coils are interchangeable with other Sun solenoid-operated valves. For optimal performance, it's recommended to use an amplifier with current sensing and adjustable dither between 100 - 250 Hz. Models equipped with manual controls have a life expectancy of approximately 7,000 cycles. The momentary-twist override option allows manual operation by twisting clockwise by 90 degrees. The valve's floating style construction minimizes internal binding risks due to installation torque or machining variations. This model fits into cavity T-11A, has a capacity of up to 6 gpm (23 L/min), and features Viton seal kits available for both cartridge and coil assemblies.

Description

This valve is a 3-way, meter-in, electro-proportional throttle. The flow path, unenergized, has the supply blocked at port 1 and port 2 connected to tank at port 3. Energizing the coil generates a closing force on the spool, creating a metering orifice in the 1 to 2 direction that is proportional to the coil command current. The valve self-compensates in the 1 to 2 direction and with the addition of an external compensator will provide pressure compensated flow control. Flow in the 2 to 3 direction is not proportional.

The transition between positions is closed.
Using 2 3-ways to create a 4-way allows one to choose existing flow ranges instead of cutting a special spool.
These valves may be pressure compensated by an external, modulating, logic element. Use LR_C-XHN for a bypass circuit or LP_C-XHN for a restrictive circuit.
The valve provides a degree of self-compensation and may be used as a flow control. To increase the accuracy of flow control, an external, modulating, logic element can be used to maintain a constant flow over a wider range of flows and pressures. See performance curves for additional information.
All ports will accept 5000 psi (350 bar).
Coils are interchangeable with Sun's other full flow, solenoid-operated valves and can be mounted on the tube in either direction.
For optimum performance, an amplifier with current sensing and adjustable dither should be used. Dither should be adjustable between 100 - 250 Hz.
On models equipped with the D or L control, the detent mechanism in the manual override is meant for temporary actuation. The D, E, L and T manual control assemblies have a mechanical life expectancy of approximately 7,000 cycles.
The momentary/twist override option "E" allows the operator to shift the valve by twisting the manual override clockwise 90 degrees.
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-11A
Series	1
Capacity	6 gpm23 L/min.
Maximum Valve Leakage at 110 SUS (24 cSt)	2 in³/min.@1000 psi30 cc/min.@70 bar
Manual Override Force Requirement	5 lbs/1000 psi @ Port 133 N/100 bar @ Port 1
Manual Override Stroke	.10 in.2,5 mm
Solenoid Tube Diameter	.75 in.19 mm
Valve Hex Size	7/8 in.22,2 mm
Valve Installation Torque	30 - 35 lbf ft41 - 47 Nm
Model Weight (with coil)	1.10 lb0,50 kg
Seal kit - Cartridge	Viton: 990-411-006
Seal and nut kit - Coil	Viton: 990-770-006Viton: 990-770-006

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 HYDRAULICSFMDBMAV4A12V

SUN HYDRAULICS
FMDBMAV4A12V