RELIEF VALVE OPEN DISCHARGE ST TYPE SCD

This valve protects a pressure system by automatically opening when the pressure exceeds a preset limit, allowing fluid to discharge freely into open atmosphere (or safe vent) rather than into a downstream piping system.

Key Features

• Open Discharge Outlet: When the set pressure is exceeded, the valve vents the excess pressure directly to the outside (ambient) rather than into a downstream pipe.

• Spring‑loaded Mechanism: A calibrated spring holds the valve shut under normal pressure. Once the pressure exceeds the set value, the spring is overcome and the valve opens.

• Manual Adjustment / Setting: The set pressure can typically be defined at installation (or factory‑set).

• Re‑seating Ability: Once pressure drops back below a set threshold (blow‑down), the valve closes again to prevent further discharge.

• Compact Connection: Commonly screwed or flanged inlet; outlet is free.

• Applications: Air/gas compressors, pressure vessels, general industrial systems where over‑pressure protection is required and discharge to atmosphere is acceptable.

Typical Sizes Available

• ½″ (15 mm) threaded inlet

• ¾″ (20 mm)

• 1″ (25 mm)

• 1½″ (40 mm)

• 2″ (50 mm)
  (Larger sizes may also be available depending on manufacturer / model series.)

Typical Spec Limits

• Set‑pressure range: e.g., 0.5 bar g up to ~10 bar g (varies by model)

• Maximum allowable temperature: depends on materials, e.g., up to ~180 °C or more

• Material: brass or steel body, corrosion‑resistant internals