SA-V Reverse Valve — Dual-Line Lubrication Change-Over
The SA-V reverse valve (reversing / change-over valve) switches pressurized grease between the two main supply lines in a dual-line centralized lubrication system. A DC geared motor drives the spool so Line A and Line B alternate on each cycle—feeding VSG/ZVB metering blocks, DW blocks, and other dual-line dividers along the plant.
Configuration options: operate as a 4/2 or 3/2 valve depending on plumbing and control scheme. Typically installed at the endpoint of the dual main headers (terminal position) where line pressure differential signals the controller to reverse direction and complete the lubrication cycle.
Rated to 40 MPa system class. Pair with differential pressure switches such as YKQ-SB or related DR4-5 directional units listed in Related Products. System hub: dual-line lubrication systems · grease pump · controller.
- Woring Principle
- Technical Parameters
Dual-Line Cycle & SA-V Role
In dual-line architecture, the pump pressurizes Line 1 while Line 2 vents. Metering blocks discharge grease to bearings on the active line. When the end-of-line pressure reaches setpoint, the SA-V reversing valve (often working with a differential pressure switch) shifts—Line 2 becomes pressurized and Line 1 vents. Each full reversal completes one lubrication cycle for all blocks on both mains.
The SA-V can also function in monitoring setups where two pipe pressures generate an electrical signal to the PLC—triggering reversal or fault alarm if a line fails to build pressure (blocked point, pump fault, or empty reservoir).
| Parameter | Specification |
|---|---|
| Working pressure | 40 MPa max |
| Temperature range | −20 °C to +80 °C |
| Port tightening torque | 18 N·m |
| Supply voltage | AC 110 V, AC 220 V, DC 24 V |
| Motor power | 42 W |
| Protection | IP65 |
| Weight | ~13 kg |
| Valve types | 4/2 or 3/2 configuration |
Related Product
In dual-line centralized grease systems, a reverse (change-over) valve alternates pressure between two main supply lines so metering blocks on each line receive grease every full cycle. It is not a refrigeration four-way valve—it is a lubrication component paired with dual-line pumps and dividers.
Typically at the end of the dual main pipelines in the terminal position of the two-line system—where line pressure is monitored and reversal is triggered. Mount in a dry, visible location with access for motor wiring and port service.
SA-V is the motorized reversing valve that physically switches line pressure. YKQ-SB is a differential pressure switch that senses when each line reaches set pressure and sends a signal to reverse or alarm. They work together: YKQ detects cycle completion; SA-V (or DR4-5) executes the switch.
No—SA-V is for dual-line systems only. Progressive systems use one supply line and sequential blocks (grease manifold blocks). Single-line injector systems use a different control logic.
Order AC 110 V, AC 220 V, or DC 24 V to match your panel or mobile electrical system. Motor is 42 W—size fuses and contactors accordingly.
Up to 40 MPa working pressure—align with 40 MPa dual-line blocks (VSG, ZVB) and pump rating. For 20 MPa plants, verify compatibility with engineering before substituting.
Mount YKQ in a dry, ventilated area at the main-line endpoint. Place a dual-line distributor behind the switch where possible so stale grease does not affect sensitivity. Wire the stroke switch to the bridge center and torque terminal screws to spec—see YKQ product page for detail.