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
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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.
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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.
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Manual Adjustment / Setting: The set pressure can typically be defined at installation (or factory‑set).
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Re‑seating Ability: Once pressure drops back below a set threshold (blow‑down), the valve closes again to prevent further discharge.
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Compact Connection: Commonly screwed or flanged inlet; outlet is free.
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Applications: Air/gas compressors, pressure vessels, general industrial systems where over‑pressure protection is required and discharge to atmosphere is acceptable.
Typical Sizes Available
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½″ (15 mm) threaded inlet
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¾″ (20 mm)
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1″ (25 mm)
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1½″ (40 mm)
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2″ (50 mm)
(Larger sizes may also be available depending on manufacturer / model series.)
Typical Spec Limits
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Set‑pressure range: e.g., 0.5 bar g up to ~10 bar g (varies by model)
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Maximum allowable temperature: depends on materials, e.g., up to ~180 °C or more
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Material: brass or steel body, corrosion‑resistant internals