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Load holding valve from Sun Hydraulics.
This valve is a pilot to open check valve. It has a sealed pilot, a steel seat, and is non-vented. It allows free flow from the valve (port 2) to the load (port 1) and blocks flow in the opposite direction. Pressure at the pilot (port 3) will open the valve from port 1 to port 2. Pilot pressure needed at port 3 to open the valve is directly proportional to the load pressure at port 1. Pressure at port 2 directly opposes pilot pressure.
Note: Data may vary by configuration. See CONFIGURATION section.
| Cavity | T-19A |
| Series | 4 |
| Capacity | 120 gpm |
| Capacity (metric) | 480 L/min. |
| Maximum Operating Pressure | 5000 psi |
| Maximum Operating Pressure (metric) | 350 bar |
| Pilot Ratio | 3:1 |
| Maximum Valve Leakage at 110 SUS (24 cSt) | 1 drops/min. |
| Maximum Valve Leakage at 110 SUS (24 cSt) (metric) | 0,07 cc/min. |
| Valve Hex Size | 1 5/8 in. |
| Valve Hex Size (metric) | 41,3 mm |
| Valve Installation Torque | 350 – 375 lbf ft |
| Valve Installation Torque (metric) | 474 – 508 Nm |
| Model Weight | 2.65 lb. |
| Model Weight (metric) | 1.20 kg. |
| Seal kit – Cartridge | Viton: 990019006 |
Control
| L | Manual Load Release |
| X | Standard Pilot |
| E | External 4-SAE Pilot Port, Port 3 Blocked |
| P | External 1/4 NPTF Pilot Port, Port 3 Blocked |
Cracking Pressure
| A | 4 psi (0,3 bar) |
| B | 15 psi (1 bar) |
| C | 30 psi (2 bar) |
| D | 50 psi (3,5 bar) |
| E | 75 psi (5 bar) |
| F | 100 psi (7 bar) |
| Z | 1 psi (0,07 bar) |
Seal Material
| N | Buna-N |
| V | Viton |
Material/Coating
| /AP | Stainless Steel, Passivated |
| /LH | Mild Steel, Zinc-Nickel |
