Rexroth HC-2-FX Lever Operated Control Air Valve P50976 – 4 200 PSI L791

Rexroth HC-2-FX Lever Operated Control Air Valve P50976 – 4 200 PSI L791

The Rexroth HC-2-FX (P/N: P50976) is a robust, high-performance, lever-operated directional control valve designed for compressed air systems. It is part of Bosch Rexroth’s extensive portfolio of pneumatic components, known for their reliability, durability, and precision in demanding industrial environments.

This specific model is a 4-way, 2-position (4/2) valve, meaning it has four ports and two distinct switching positions to control the flow of air to a double-acting pneumatic cylinder or actuator.

Key Features & Specifications

• Manufacturer / Brand: Bosch Rexroth

• Model: HC-2-FX

• Rexroth Part Number: P50976

• SEO / Alternate Number: L791

• Actuation Method: Lever Operated. This manual operation allows for direct and intuitive control, making it ideal for applications requiring manual cycling, testing, emergency stop, or maintenance functions.

• Function: 4/2 (4-way, 2-position). In one lever position, it extends a cylinder; in the other, it retracts it.

• Maximum Operating Pressure: 200 PSI (approximately 14 bar). This rating indicates it is suitable for standard industrial compressed air systems.

• Port Size: Typically 1/4″ NPT or G1/4, which is standard for valves in this flow capacity. (It is always recommended to verify the specific port size from the manufacturer’s datasheet).

• Flow Capacity (Cv value): The HC series generally has a good flow capacity, allowing for efficient operation of small to medium-sized cylinders. The exact Cv value for this model should be confirmed from the technical datasheet.

• Construction: Built with a durable metal housing (often aluminum or brass) and high-quality seals (such as NBR), ensuring a long service life and resistance to wear.

• Mounting: Standard inline port mounting. Can be easily integrated into a pneumatic system using appropriate fittings.

• Spring Return: The “FX” designation typically indicates that the lever is not detented; it is spring-returned to one of the two positions. When the operator releases the lever, it automatically returns to its default (home) position.

Typical Applications

This valve is commonly used in situations where reliable manual control is paramount:

• Machine Setup and Maintenance: For manually jogging or positioning actuators during installation, adjustment, or repair.

• Emergency Operation: As a manual override in case of power or control system failure.

• Testing and Prototyping: In labs or workshops for testing pneumatic circuits and components.

• Clamping and Safety Circuits: To manually apply or release a clamping force.

• Industrial Machinery: Used on a wide range of equipment including packaging machines, assembly stations, and material handling systems.

How It Works (Functional Description)

A 4/2 valve has four ports:

1. P (Pressure / Supply): Connects to the compressed air source.

2. A (Outlet 1): Connects to one port of a double-acting cylinder.

3. B (Outlet 2): Connects to the other port of the cylinder.

4. R / S (Exhaust): Vents the unused air to the atmosphere.

Position 1 (Lever Actuated):

• Air flows from P → B, extending the cylinder.

• Exhaust air from the cylinder’s opposite side flows from A → R/S out to the atmosphere.

Position 2 (Lever Released – Spring Return):

• Air flows from P → A, retracting the cylinder.

• Exhaust air flows from B → R/S out to the atmosphere.