Gaggia 421941224951 Safety Valve 16-18 Bar for Vibration Pump

Overpressure Protection for Gaggia Vibration Pump Systems

The Gaggia 421941224951 safety valve is an original overpressure valve (OPV) assembly that screws directly into the vibration pump on selected Gaggia and Saeco espresso machines. It releases excess pressure before the pump or hydraulic circuit reaches damaging levels. The factory setting opens at 16 to 18 bar.

The valve body uses PVC with a threaded inlet that matches the standard vibration pump outlet. A spring-loaded plunger lifts off its seat when pressure exceeds the setpoint, diverting water back toward the tank or drain path. The assembly measures approximately 45 x 15 x 35 mm and ships as a single unit. Thread-locker compound secures the factory setting, and Gaggia advises against field adjustment because the PVC body can crack under heat and torque.

Gaggia and Saeco cross-reference the part under 11010166, 11004689, 996530068178, 110124863, and 421941224951. Philips lists the equivalent as 996530068178. The valve serves Gaggia Classic Pro and Classic Evo models, the RI9403 series, and several Saeco platforms including Odea, Xsmall, Spidem, and Syntia. Confirm the pump mount and hose routing before ordering, because some older machines use a different OPV body.

Key Features

• 16-18 Bar Factory Setting
  The valve opens within the 16 to 18 bar band to protect the pump and hydraulic circuit.

• Pump-Mounted OPV Assembly
  The threaded body screws straight into the vibration pump outlet for a direct replacement.

• PVC Construction

  • Moulded body with a threaded inlet
  • Spring-loaded plunger and seat
  • Approximate dimensions of 45 x 15 x 35 mm

• Cross-Reference Part Coverage
  The unit matches Gaggia 11010166, 11004689, 996530068178, 110124863, and Philips 996530068178.

• Single-Unit Service Pack
  One valve assembly per pack supports scheduled pump and hydraulic maintenance.

• Sealed Factory Calibration
  Thread-locker compound holds the setpoint, and Gaggia warns against field adjustment of the PVC body.

Specifications

What’s in the Box

• 1 x overpressure valve assembly

Why Choose This Valve

• The 16-18 bar relief point protects the vibration pump from overpressure during a blocked or restricted brew path.

• A direct pump-mount thread removes the need for adapters on supported Gaggia and Saeco models.

• Cross-reference coverage simplifies stock consolidation across Gaggia, Saeco, and Philips service parts.

• The sealed calibration avoids drift from vibration and thermal cycling in daily use.

• PVC construction resists corrosion in the wet pump environment.

• A single-unit pack suits bench repairs and scheduled hydraulic maintenance.

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