4-way, 3-position, meter in proportional directional valve
Symbols for FTDC
This valve is a 4-way, 3-position proportional directional valve. Work ports 2 and 4 are drained to 5 in the center position and port 3 is closed. Pilot pressure at port 1 opposes the spring and creates a variable metering orifice between ports 3 and 4 that is proportional to the pressure at 1. Piloting 6 opens 3 to 2. The force balance of the flow forces, spring and pilot pressure results in a degree of partial self-compensation as the load pressure changes.
Pressure at ports 1 and 6 directly oppose each other.
- Pilot ports 1 and 6 will accept 5000 psi (350 bar), however, pressures over 500 psi (35 bar) do not increase flow since at this point the spool will be fully shifted.
- 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.
- Pressure at ports 1 and 6 directly oppose each other.
- 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-52A |
| Series | 2 |
| Capacity | 18 gpm70 L/min. |
| Maximum Operating Pressure | 5000 psi350 bar |
| Pilot Pressure Required to Shift Valve | 50 - 120 psi3,5 - 8 bar |
| Pilot Pressure Required for Full Shift at Rated Flow | 290 - 340 psi20 - 23 bar |
| Maximum Valve Leakage at 110 SUS (24 cSt) | 2.7 in³/min.@500 psi44 cc/min.@35 bar |
| Pilot Volume Displacement | .04 in³0,66 cc |
| Hysteresis at 50% command | ±35%±35% |
| Valve Hex Size | 1 1/8 in.28,6 mm |
| Compensated Flow (using LPJCXHN) | 17 - 21 gpm64 - 80 L/min. |
| Valve Installation Torque | 45 - 50 lbf ft61 - 68 Nm |
| Model Weight | 1.00 lb0,45 kg |
| Seal kit - Cartridge | Buna: 990052007 |
| Seal kit - Cartridge | Viton: 990052006 |
Direct-acting valves are used to prevent over pressure, and pilot-operated valves are used to regulate pressure. If you are unsure, use a direct-acting valve. Sun's direct acting valves are very fast, dirt tolerant, stable, and robust. Sun's pilot-operated valves are moderately fast, they have a low pressure rise vs. flow curve, and they are easy to adjust.
There are exactly 250 Sun drops in a cubic inch or 15 in a cc.
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