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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 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 to open the valve is directly proportional to the load pressure at port 1. The valve is insensitive to pressure at port 2 because the spring chamber is referenced to the vent (port 4).
Note: Data may vary by configuration. See CONFIGURATION section.
| Cavity | T-21A |
| Series | 1 |
| Capacity | 15 gpm |
| Capacity (metric) | 60 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 | 7/8 in. |
| Valve Hex Size (metric) | 22,2 mm |
| Valve Installation Torque | 30 – 35 lbf ft |
| Valve Installation Torque (metric) | 41 – 47 Nm |
| Adjustment Screw Internal Hex Size | 1/8 in. |
| Adjustment Screw Internal Hex Size (metric) | 3,2 mm |
| Locknut Hex Size | 7/16 in. |
| Locknut Hex Size (metric) | 11,1 mm |
| Model Weight | 0.39 lb. |
| Model Weight (metric) | 0.18 kg. |
| Seal kit – Cartridge | Viton: 990021006 |
Control
| X ★ | Standard Pilot |
| L | Manual Load Release |
Cracking Pressure
| C ★ | 30 psi (2 bar) |
| A | 4 psi (0,3 bar) |
| B | 15 psi (1 bar) |
| D | 50 psi (3,5 bar) |
| E | 75 psi (5 bar) |
| F | 100 psi (7 bar) |
Seal Material
| N ★ | Buna-N |
| V | Viton |
| E | EPDM |
Material/Coating
| /AP | Stainless Steel, Passivated |
| /LH | Mild Steel, Zinc-Nickel |
