2-vías , pilot-shifted, proporcional estrangulación con con drenaje

This valve is a 2-way, 2-position proportional throttle. Ports 2 and 3 are normally closed. Pilot pressure at port 1 creates a metering orifice between port 2 and 3 that is proportional to the pressure at 1. The force balance of the flow forces, spring and pilot pressure results in a degree of partial self-compensation as the load pressure changes.

This valve includes a bleed-down feature which connects ports 3 to 4 in the spring-biased position. The bleed-down feature is useful when the valve is used as a meter-in flow control in circuits which include counterbalance valves downstream of port 3. The bleed-down connection is closed as the valve is piloted with increasing pressure at port 1.

Pressure at port 4 directly opposes pressure at port 1.

• 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.
• Ports 1 and 4 should be limited to 500 psi (35 bar).
• Pressure at port 4 directly opposes pressure at port 1.
• An optional tuning adjustment (L control) is offered to vary the pilot pressure required to control flow. The tuning adjustment provides a means to manually increase or decrease flow at a given pilot pressure. The adjustment range is 50 - 250 psi (3,5 - 15 bar), 100 psi (7 bar) Standard Setting.
• Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage the seals.
• Accurate pressure compensated control requires that a constant pressure differential be maintained across the valve.
• 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.

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• Manufacturing Sun Cartridge Cavities (522.27 KB)

• Units of Measure, Settings, and Conversions
• Sun Model Code Explanation; 999-901-334 (343.9 KB)
• Performance Data
• Cartridges: Materials of Construction
• Cavity Information (S-171) and Tooling
• Fluid Recommendations: Oil Viscosity, Cleanliness & Temperature
• Sun's Floating Style Screw-In Cartridge (1.06 MB)