When a valve stem becomes stuck in a gate of the hot runner, the actuation plate can continue to move while the piston remains stationary. The valve stem may also be protected from an over force situation such as if the valve stem encounters an obstruction as the actuation plate is moving...
Solid particle erosion (SPE) that results from solid particles entrained in the steam flow, which impinge on the main stop valve stem, and can result in stem failure Sticking, which happens as a result of oxidation and occurs when the stop valve is stuck in the open position, and can requ...
Mushroomed or damaged stem tips: Check for worn or damaged rocker arms, too. Incorrect installed stem height can be the underlying cause here by creating too much back and forth scrubbing across the tip of the stem every time the valve opens and closes. High lift cams and rocker arms can ...
Improperly installed valves or worn components often result in leaks. Depending on the medium, leaking valves can wear out seals and other valve components, as well as potentially damage the area around the leak. Stuck Valves Stuck valves are the bane of any production that relies on fluid cont...
Human-induced pluripotent stem cells (hiPSCs) have revolutionized the field of regenerative medicine by enabling the production of robust functional cells that were previously difficult to obtain, such as cardiomyocytes (Yoshida & Yamanaka 2017), neural cells (Chang et al. 2019), and hepatocytes (Ra...
it is recommended to inspect and maintain the globe valve every 5 to 10 years to ensure its normal operation and safe use. If the shut-off valve is found to be leaking, stuck, rusted, etc., it needs to be replaced immediately to avoid other problems.When replacing American standard globe...
This keeps the guide from becoming stuck in the seat. External Globe Valve Maintenance Check the motion of the stem, which is often the threaded piece exposed to the elements and can easily become dirty or gritty. Lubricate it often to ensure smooth function of the valve. If any of the ...
Internally, the “butterfly” or disk is attached to the stem, which is turned by an actuator (either manual or powered). When the valve is closed, the disk is turned so that it completely blocks off the passageway. When the valve is fully open, the disk is rotated a quarter-turn so...
Generally, this issue happens due to friction within the valve stem. Actuator Malfunction The Actuators of the butterfly valves are very durable. They generally don’t show any malfunctioning. However, if the valve is used for years, the actuator can get stuck in one place. The disc goes ...
2f core 31 when the coil 18 is energized. This deflection of the spring causes it to bias the core 31 for downward movement. When the coil 18 is deenergized, this bias tends to move the shell downward and thus to disengage any surfaces 2, which may be stuck together by a gum deposit...