The Koshin 0430625 PBX Air Valve is a specialized replacement part designed for Koshin PBX series submersible pumps. These pumps are often referred to as "contractor pumps" or "trash pumps" because they are built to handle tough environments.

Primary Functions

The air valve serves a few critical roles in the operation of the pump:

• Priming Assistance: It helps the pump manage air pockets during the initial startup, ensuring that water can be drawn into the casing effectively.

• Preventing Air Lock: In submersible applications, air can sometimes get trapped in the impeller chamber. The valve allows this air to escape so the pump doesn't lose "prime" and stop moving water.

• Pressure Regulation: It maintains the internal pressure balance required for the pump to operate at its rated flow and head height.

When to Replace It

If you notice the following issues with your PBX pump, the air valve might be clogged or damaged:

• The motor is running, but no water is coming out.

• The pump is "choking" or vibrating excessively.

• Water is leaking from the valve area (indicating a failed seal within the valve assembly).

Technical Context

This specific part is typically found in the PBX-55022 and PBX7-55022 models. Because these pumps are often used in construction sites or for emergency drainage, the air valve is a common wear-and-tear item that can get fouled by silt or debris over time.

Suiatable for all PBX Pumps KOSHIN: PBX7-55022-BAA/BAB/BAC/BAD/BAE, PBX7-55011-BAB/BAC, PBX7-65011-BAB