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  2. Valve guide - Wikipedia

    en.wikipedia.org/wiki/Valve_guide

    The upper part of the valve stem, within the rocker box, is lubricated by oil. If this oil travels unchecked along the valve stem, engine HC emissions will become excessive. To control this, an elastomeric seal is fitted over the top of the valve guide. These may wear or stiffen with age, so are usually replaced whenever valves are removed for ...

  3. Schrader valve - Wikipedia

    en.wikipedia.org/wiki/Schrader_valve

    The Schrader valve consists of a valve stem into which a valve core is threaded. The valve core is a poppet valve assisted by a spring. A small rubber seal located on the core keeps the fluid from escaping through the threads. Using the appropriate tools, a faulty valve core can be immediately extracted from the valve stem and replaced with a ...

  4. Valve actuator - Wikipedia

    en.wikipedia.org/wiki/Valve_actuator

    Electric actuator (blue cylinder) on a valve in a power plant. A black handwheel is visible on the actuator, which allows manual positioning of the valve. The blue valve body is visible in-line with the pipe. The valve actuator opens or closes the butterfly disc of the valve based on electrical signals sent to the actuator.

  5. Flow control valve - Wikipedia

    en.wikipedia.org/wiki/Flow_control_valve

    These valves achieve this using **pressure-compensated mechanisms**, which automatically adjust the valve opening to ensure a steady flow rate. Some designs incorporate a **dual-chamber configuration** that enhances regulation at lower pressures, improving stability in applications such as **irrigation, industrial water systems, and municipal ...

  6. Globe valve - Wikipedia

    en.wikipedia.org/wiki/Globe_valve

    Long-stemmed globe valve. The stem serves as a connector from the actuator to the inside of the valve and transmits this actuation force. Stems are either smooth for actuator-controlled valves or threaded for manual valves. The smooth stems are surrounded by packing material to prevent leaking material from the valve.

  7. Valve stem - Wikipedia

    en.wikipedia.org/wiki/Valve_stem

    A valve stem is a self-contained valve that opens to admit gas to a chamber (such as air to inflate a tire), [1] and is then automatically closed and kept sealed by the pressure in the chamber, or a spring, [2] [3] or both, to prevent the gas from escaping.