Description
SF Series Valves and Indicators: Advanced Control for Pressure Filters
The efficiency of hydraulic systems depends on integrated flow management devices. Stauff offers a complete range of valves and indicators to configure pressure filters according to specific application requirements.
Types of Integrated Valves
The valves are inserts mounted in the filter head to manage flow:
- Non-Bypass Insert (HVO): Standard insert without a valve function. All fluid passes through the element; the element’s collapse pressure must exceed system pressure.
- Bypass Valve (HVB): Allows oil to bypass the element when differential pressure reaches 6 bar (+0.5 bar), protecting the element from collapse. Typically used with elements featuring low collapse resistance (30 bar).
- Reverse Flow Valve (HVR): Allows fluid to pass in the reverse direction without filtration, preventing backflushing of the element.
- Check Valve (HVN): Prevents the pressure line from draining during filter maintenance.
- Multi-Function Valve (HVM): A unit that combines three functions: bypass, reverse flow, and check valve.
HI Series Clogging Indicators
The indicators monitor differential pressure and signal element clogging. The standard setting is 5 bar (±10%), higher than optional indicator settings to ensure alarm activation before bypass opening.
Available Variants
- Plug (HI-O): Seals the port when no indicator is required.
- Visual (HI-A / HI-V): Mechanical indication available with automatic reset (HI-A) or manual reset (HI-V).
- Electrical (HI-E): Switch for remote signaling.
- Visual-Electrical (HI-P / HI-D): Combine a switch and LED (e.g. HI-D024 with Green/Yellow/Orange/Red LED).
Thermo-Stop Function
Indicators can be equipped with a Thermo-stop function, which inhibits the alarm below 20°C to prevent false signals caused by high fluid viscosity at low temperatures.
Technical Specifications and Materials
- Body: Stainless steel (standard series) or brass (HI-D series).
- Seals: NBR (Buna-N) or FKM (Viton).
- Connection: G 1/2 thread.
Summary technical table of the main features of Valves and Indicators for Stauff Pressure Filters.
| Feature | Value |
|---|---|
| Product Type | Insert valves and differential indicators |
| Filter Compatibility | SF Series (Pressure Filters) |
| Bypass Valve Setting (HVB) | 6 bar (+0.5 bar) |
| Special Valve Functions | Reverse flow (HVR), Check valve (HVN), Multi-function (HVM) |
| Standard Indicator Setting | 5.0 bar (±10%) |
| Indicator Types | Plug (HI-O), Visual (HI-A/V), Electrical (HI-E), Visual-Electrical (HI-P/D) |
| Thermo-stop Temperature | 20°C (signal inhibited below this temperature) |
| Indicator Connection | G 1/2 thread |
| Indicator Body Materials | Stainless steel (std), Brass (HI-D) |
| Seal Materials | NBR (Buna-N), FKM (Viton) |