paisventiili

Paisventtiili is a valve designed to relieve excess pressure in a closed system to prevent damage or hazards. It is a safety device used in hydraulic circuits, pneumatic lines, steam boilers, and water distribution networks. The device remains closed during normal operation; a spring, or a pilot line, holds the valve shut. When system pressure reaches the valve’s set point, the valve opens to vent fluid or gas to a reservoir, atmosphere, or downstream line. After the pressure falls below the opening threshold, the valve reseats and stops venting.

There are direct-acting versions, which respond directly to pressure, and pilot-operated versions, which use a separate control line to drive the main valve. Some designs are balanced to minimize the force needed to close the valve, improving stability during cycling. Common materials include carbon steel, stainless steel, brass, and plastics, selected for compatible fluids and temperatures. The set pressure is adjustable on many models, typically via an adjusting screw and locknut, and calibration or certification is often required for safety-critical systems.

Installation considerations include correct sizing for flow, proper venting path, backpressure effects, and regular maintenance to check for leakage and ensure correct set point. In many jurisdictions, paisventtiili is referred to as a pressure relief valve or safety valve; terminology may vary, with “paineventtiili” or “paineensäästöventtiili” also used.