2-041-94-4870 2041944870 FESTO Air Solenoid Valve 558370 VUVB-ST12-B52-ZH-QX-D-1T1

When a 5/2 bistable valve stops shifting or loses its hold position, the machine's pneumatic sequence stalls. This valve restores that function on Homag equipment. Replacing the failed unit with the correct part number keeps the air circuit working as designed, without adapting the sub-base or wiring.

The FESTO 558370 valve is a 5/2 bistable air solenoid valve with electrical actuation and a sub-base pneumatic connection. It carries part numbers 2-041-94-4870 and 2041944870. Before ordering, read the existing valve body and match the code VUVB-ST12-B52-ZH-QX-D-1T1, plus the 558370 model number, to confirm the fit.

Mounting is through the sub-base, so check the sub-base port pattern and the electrical plug on the old valve before removal. The 5/2 bistable function holds its last position without continuous power. That matters where the machine must keep an actuator state through a power interruption or a stop in the cycle.

Supply comes as the valve only; no other items are confirmed. Send the machine model, the valve code VUVB-ST12-B52-ZH-QX-D-1T1, and photos of the old valve and its sub-base with your enquiry. Confirm the part numbers 2-041-94-4870 and 2041944870 in writing so the order matches the unit you are replacing. Supply comes from the same range as the rest of the catalogue.

What the specification fixes, and what it leaves to the machine:

• Directional control function — 5/2 bistable valve function lets one valve control a double-acting actuator and hold its last position when power is removed.
• Flow range for actuator sizing — Standard nominal flow rate of 260 L/min to 450 L/min gives the range to check against the air demand of the actuator.
• Sub-base mounting interface — Pneumatic connection 1 is sub-base, so the valve seats on a sub-base rather than inline ports, keeping the air piping in place.
• Electrical actuation — Electrical actuation type means the valve is switched by a solenoid signal from the machine control, not by manual lever or air pilot.
• Bistable hold behaviour — Bistable operation keeps the spool in its last shifted position, which suits sequences that must not reset on a power drop.
• Homag machine spare fit — The valve is supplied for Homag machine spares use, so it is ordered against the machine's existing part number rather than by size alone.
• Part number cross-check — Two part numbers, 2-041-94-4870 and 2041944870, let the buyer match either the Homag number or the alternate number on the old unit.
• Model code identification — Model number 558370 and code VUVB-ST12-B52-ZH-QX-D-1T1 on the valve body give two identifiers to verify before ordering.

What changes on the shop floor once the unit is in place:

• Restores the original pneumatic sequence. Fitting the valve with the matching part number brings the machine's 5/2 bistable function back to its designed behaviour instead of working around a failed valve.
• Holds position without continuous power. Bistable operation keeps the last shifted state, so an actuator stays where the cycle left it through a stop or power interruption.
• Flow range covers common actuator demand. The 260 L/min to 450 L/min nominal flow range gives the buyer a stated figure to compare with the air demand of the actuator being controlled.
• Sub-base connection keeps piping intact. Because the pneumatic connection is sub-base, the air lines stay on the sub-base and only the valve is swapped, shortening the repair.
• Two part numbers simplify matching. Buyers can match either 2-041-94-4870 or 2041944870 against the old valve, which helps when the machine plate and the valve body carry different numbers.
• Electrical actuation matches machine control. The solenoid is driven by the machine's electrical signal, so the replacement follows the existing control wiring rather than needing a new actuation method.
• Clear identifiers reduce wrong orders. The model number 558370 and the code VUVB-ST12-B52-ZH-QX-D-1T1 give two checks before ordering, cutting the risk of a valve that will not fit the sub-base.

Match the part numbers and valve code on your old unit. Check that the existing valve shows 2-041-94-4870 or 2041944870, model 558370, and the code VUVB-ST12-B52-ZH-QX-D-1T1 before ordering.

It is a five-port, two-position valve that holds its last position when power is removed. That suits an actuator that must stay put through a stop rather than spring back.

The standard nominal flow rate is 260 L/min to 450 L/min. Compare that range with the air demand of the actuator the valve controls.

Through a sub-base. Pneumatic connection 1 is sub-base, so the valve mounts on the sub-base and the air piping stays in place during replacement.

By electricity. The actuation type is electrical, so the solenoid is switched by the machine control signal.

Send the machine model, the valve code VUVB-ST12-B52-ZH-QX-D-1T1, and photos of the old valve and its sub-base. State which part number, 2-041-94-4870 or 2041944870, is on your unit.

Ask for the quantity you need in your enquiry. Availability and order terms are confirmed in the reply, so state the number of valves you want.

The valve is supplied as the part identified by the part numbers and code given. Ask in your enquiry if you need to confirm exactly what arrives with the order.