Walvoil VDA 3/8" BSP Unloader Valve, 25 L/min, 100-250 Bar, Aluminium
1210021101
Product Features:
Walvoil VDA 3/8" BSP Unloader Valve, 25 L/min, 100-250 Bar, Aluminium
Product: Walvoil VDA 38 3/8" BSP Unloader Valve, 25 L/min, Aluminium, 100-250 Bar
The Walvoil VDA 38 is a single acting hydraulic unloader valve with a built-in check valve, automatically operated by an internal pressure pilot.
This VDA 38/TR.S.VRR configuration features an aluminium body, G3/8 standard threaded connections, 25 L/min nominal flow and a 100-250 bar pressure setting range. Walvoil product code: 1210021101.
Main Features
- Adjustable pressure setting range from 100-250 bar (1450-3600 psi)
- 25 L/min (6.6 US gpm) nominal flow capacity
- G3/8 standard threaded hydraulic connections
- Single acting unloader valve with built-in check valve
- Lightweight aluminium valve body
Technical Data
| Specification | Details |
|---|---|
| Manufacturer | Walvoil |
| Valve Series | VDA 38 |
| Full Type | VDA 38/TR.S.VRR |
| Walvoil Code | 1210021101 |
| Valve Type | Hydraulic Unloader Valve |
| Operation | Automatically Operated by Internal Pressure Pilot |
| Configuration | Single Acting with Built-In Check |
| Port Size | G3/8 Standard Thread |
| Body Material | Aluminium |
| Pressure Setting Range | 100-250 bar (1450-3600 psi) |
| Standard Setting | 200 bar at 5 L/min (2900 psi at 1.32 US gpm) |
| Standard Differential Pressure | 15% |
| Nominal Flow | 25 L/min (6.6 US gpm) |
| Recommended Fluid | Mineral Based Oil |
| Oil Viscosity | 10-200 cSt |
| Maximum Contamination Level | 18/16/13 ISO 4406 |
| Fluid Temperature | -20°C to +80°C with NBR seals |
| Environmental Working Temperature | -40°C to +100°C |
| Approx. Weight | 2.15 kg (4.73 lb) |
Walvoil VDA Model Variations
The Walvoil VDA range is available with different port sizes, aluminium or steel bodies and optional drain port configurations. The current 1210021101 model is highlighted below.
| Walvoil Code | Type | Port Size | Body | Drain Port | Setting Range |
|---|---|---|---|---|---|
| 1210021101 | VDA 38/TR.S.VRR | G3/8 | Aluminium | No | 100-250 bar |
| 1210021113 | VDA 38/DR/TR.S.VRR | G3/8 | Aluminium | Yes | 100-250 bar |
| 1210022101 | VDA 38/TR.S.VRR/ac | G3/8 | Steel | No | 100-250 bar |
| 1210031101 | VDA 12/TR.S.VRR | G1/2 | Aluminium | No | 100-250 bar |
| 1210031104 | VDA 12/DR/TR.S.VRR | G1/2 | Aluminium | Yes | 100-250 bar |
| 1210032101 | VDA 12/TR.S.VRR/ac | G1/2 | Steel | No | 100-250 bar |
| 1210041101 | VDA 34/TR.S.VRR | G3/4 | Aluminium | No | 100-250 bar |
| 1210041108 | VDA 34/DR/TR.S.VRR | G3/4 | Aluminium | Yes | 100-250 bar |
| 1210042100 | VDA 34/TR.S.VRR/ac | G3/4 | Steel | No | 100-250 bar |
How the Walvoil VDA Unloader Valve Works
The Walvoil VDA is an unloader valve automatically operated by an internal pressure pilot. The valve is designed to unload the hydraulic circuit when the predetermined pressure condition is reached.
The single acting configuration incorporates a built-in check valve, providing a compact solution for hydraulic systems requiring automatic unloading and pressure management.
Key Benefits
- Automatic operation through an internal pressure pilot
- Built-in check valve reduces the need for separate circuit components
- Adjustable 100-250 bar pressure setting range
- Multiple G3/8, G1/2 and G3/4 configurations available
- Aluminium, steel and drain-port variants available within the VDA range
Pressure specification note: Walvoil specifies a 100-250 bar pressure setting range for product code 1210021101.
Always confirm the required port size, body material, drain configuration and Walvoil product code against your hydraulic system before ordering.
Choosing the Correct Walvoil VDA Valve
Choose the required VDA model according to the hydraulic port size, body material and whether an external drain port is required.
If replacing an existing valve, matching the complete Walvoil type and product code is recommended wherever possible.
Contact Us for product identification, availability and delivery information.
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| Service | Price | Terms |
|---|---|---|
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