Belgas P800 Relief Valve

The P800 Relief Valve is a compact, direct-acting, in-line safety device engineered to provide reliable overpressure protection in pneumatic systems. Factory-preset for precise performance, the valve is designed to automatically relieve excess pressure in the event of regulator malfunction or abnormal pressure rise.

With its robust construction and rolling diaphragm design, the P800 delivers high accuracy, rapid response, and stable operation across varying supply conditions. It is commonly installed between a pneumatic instrument and its supply regulator to ensure that the instrument air pressure does not exceed 50 PSIG, safeguarding critical equipment and maintaining system integrity.

Designed for demanding industrial environments, the P800 features a tamper-resistant spring case to maintain calibration integrity and prevent unauthorized adjustments. Its straightforward in-line configuration allows easy installation and dependable long-term service with minimal maintenance.

Technical Specifications

Type:
Direct-operated, in-line relief valve

Function:
Provides automatic pressure relief to protect pneumatic instruments from overpressurization caused by supply regulator failure

Preset Pressure:
Factory-set to limit instrument supply to 50 PSIG

Design Features:

• Rolling diaphragm for enhanced accuracy and consistent relief performance

• Tamper-resistant spring case to prevent unauthorized calibration changes

• Compact in-line design for simple installation

Applications:

• Instrument air supply systems

• Pneumatic control circuits

• Protection of sensitive pressure instruments and regulators

Operating Medium:
Clean, dry compressed air or compatible inert gases

Construction:
Durable materials suitable for industrial pneumatic environments (material options depend on model variation)

Performance Characteristics:

• Fast response to overpressure events

• Stable operation across varying supply pressures

• Factory-calibrated for reliable setpoint accuracy