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Load holding valve from Sun Hydraulics.
Counterbalance valves with pilot assist are meant to control an overrunning load. The check valve allows free flow from the directional valve (port 2) to the load (port 1) while a direct-acting, pilot-assisted relief valve controls flow from port 1 to port 2. Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio.
Other names for this valve include motion control valve and over-center valve.
Note: Data may vary by configuration. See CONFIGURATION section.
| Cavity | T-17A |
| Series | 3 |
| Capacity | 60 gpm |
| Capacity (metric) | 240 L/min. |
| Pilot Ratio | 2:1 |
| Maximum Recommended Load Pressure at Maximum Setting | 3075 psi |
| Maximum Recommended Load Pressure at Maximum Setting (metric) | 215 bar |
| Maximum Setting | 4000 psi |
| Maximum Setting (metric) | 280 bar |
| Factory Pressure Settings Established at | 2 in³/min. |
| Factory Pressure Settings Established at (metric) | 30 cc/min. |
| Maximum Valve Leakage at Reseat | 5 drops/min. |
| Maximum Valve Leakage at Reseat (metric) | 0,3 cc/min. |
| Adjustment – No. of CCW Turns from Min. to Max. Setting | 3.75 |
| Operating Characteristic | Standard |
| Reseat | >85% of setting |
| Valve Hex Size | 1 1/4 in. |
| Valve Hex Size (metric) | 31,8 mm |
| Valve Installation Torque | 150 – 160 lbf ft |
| Valve Installation Torque (metric) | 203 – 217 Nm |
| Adjustment Screw Internal Hex Size | 5/32 in. |
| Adjustment Screw Internal Hex Size (metric) | 4 mm |
| Locknut Hex Size | 9/16 in. |
| Locknut Hex Size (metric) | 15 mm |
| Locknut Torque | 80 – 90 lbf in. |
| Locknut Torque (metric) | 9 – 10 Nm |
| Model Weight | 1.36 lb. |
| Model Weight (metric) | 0.62 kg. |
| Seal kit – Cartridge | Viton: 990017006 |
Control
| C | Tamper Resistant – Factory Set |
| L | Standard Screw Adjustment |
| R | Lockwired Screw Adjustment |
Functional Setting Range
| A | 1000 – 4000 psi w/4 psi Check (70 – 280 bar w/ 0,3 bar Check), 3000 psi (210 bar) Standard Setting |
| B | 400 – 1500 psi w/4 psi Check (28 – 105 bar w/ 0,3 bar Check), 1000 psi (70 bar) Standard Setting |
| H | 1000 – 4000 psi w/25 psi Check (70 – 280 bar w/ 1,7 bar Check), 3000 psi (210 bar) Standard Setting |
| I | 400 – 1500 psi w/25 psi Check (28 – 105 bar w/ 1,7 bar Check), 1000 psi (70 bar) Standard Setting |
Seal Material
| N | Buna-N |
| V | Viton |
Material/Coating
| /AP | Stainless Steel, Passivated |
| /LH | Mild Steel, Zinc-Nickel |
