Parker PXB-B3911 Pneumatic Push Button

The Parker PXB-B3911 is a Pneumatic Manual Control Valve Body from the PXB Series, specifically designed to function as a pneumatic push button switch when paired with a corresponding actuator head (such as the ZB4 or ZB5 series).¹

This unit is the core switching element used for Human-Machine Interface (HMI) in pneumatic control circuits.

Key Specifications and Features

Feature	Specification
Product Type	Valve Body / Switch Body (Requires actuator head)
Control Mechanism	Plunger (for spring-return activation)
Function	3/2-way (3 ports, 2 positions)
Switching Style	NNP (Normally Non-Passing), commonly referred to as Normally Closed (NC). However, the PXB-B3 series valves are Universal and can be configured as NC or NO depending on how the pressure supply is connected.
Connection Type	$\mathbf{\text{Ø}4 \text{ mm}}$ Push-in fittings (for semi-rigid tube)
Maximum Operating Pressure	$9 \text{ bar}$
Maximum Flow Rate	$60 \text{ L/min}$ (This is the standard flow rate of the PXB-B3 series)
Operating Temperature	$-15 \text{ °C}$ to $+60 \text{ °C}$
Seals	High-quality Viton seals for reliability and durability.
Actuation	Designed for spring return, plunger-actuated operation.

Modular System and Versatility

The PXB-B3911 is part of a modular system that offers significant flexibility:²

Modular Construction: Up to three valve bodies or electrical contact blocks (or a combination) can be mounted onto a single operating head, allowing for a single push of the button to simultaneously control multiple pneumatic functions and provide electrical feedback (e.g., to a PLC).³
Mounting Standard: The unit fits the standard ⁴ $\text{Ø}22 \text{ mm}$ diameter panel cut-out used for electrical push buttons.⁵
Positive or Vacuum Service: Suitable for use in both positive pressure (compressed air) and vacuum line applications.⁶
Compatibility: It is designed to be paired with Parker’s ZB4 (Metal Head) or ZB5 (Plastic Head) line of operator heads (push buttons, mushroom heads, selector switches, etc.).