Sun Hydraulics FDCBYBV 流量控制阀-产品快照

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Sun Hydraulics FDCBYBV 流量控制阀

FDCBYBV - Fully adjustable pressure compensated flow control valve with reverse flow check

Sun Hydraulics

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-5A Series 2 Capacity 12 gpm45 L/min. Maximum Operating Pressure 5000 psi350 bar Adjustment - Number of Counterclockwise Turns - Fully Closed to Fully Open 55 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 .60 lb0,30 kg Seal kit - Cartridge Viton: 990-203-006 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. Related Files Technical TipsTechnical Tips for Manufacturing Sun Cartridge Cavities (522.27 KB) Technical Tips for Check, Flow Control, and Priority Flow Control (537.44 KB) Sun's Floating Style Screw-In Cartridge (719.9 KB) Sun Model Code Explanation; 999-901-334 (343.9 KB)

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