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...
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 ...
A gate valve can also become stuck (seized) in either the open or shut position, which means it cannot perform its function correctly and that it might develop a leak. This can happen from lack of use, so you should regularly open and close a valve to make sure it doesn’t become stu...
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 requir...
Stuck Valves Stuck valves are the bane of any production that relies on fluid control. Corrosion, accumulated debris, and inadequate lubrication are the most common reasons a valve might stick. Corroded Valves Corrosion weakens valve components and sealing surfaces. Leaking, sticking, and valve failur...
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...
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...
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...
stuck and unmovable. The present invention further provides a valve actuating mechanism including a guideless valve bridge with specifically configured contact faces which prevents both the excess axial movement of the valve stem and the transfer of undesired loads to the valve stem or adjacent ...
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...