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 ...
例如,'valve seat'翻译为“阀座”,指的是阀门中用于支撑阀芯并与其形成密封面的部分;'valve stem'翻译为“阀杆”,是连接阀芯与操作机构的部件,用于传递操作力;'valve body'翻译为“阀体”,是阀门的主要承载部件,负责容纳阀芯、阀座等零件并承受流体压力。 此外,还有一些与'valve'相关...
B Detection of stuck valves ItemPotential errorsHEPEF Given that a locally operated valve sticks as it is being changed or restored,athe operator fails to notice the sticking valve, when it has: (1)A position indicatorbonly0.0013 (2)A position indicatorband a rising stem0.0023 ...
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...
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...
A device for turning off a valve for a utility such as gas or water includes a spring loaded valve assembly (131) and a valve stem (137) held away from a valve seat (140) by a latch (133). When the latch (133) is tripped, the valve closes. In one embodiment, there are two su...
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 ...
When a valve stem strips, the handle may still turn, but it won't open or close the faucet. Alternatively, it may still operate the faucet, but it will fuse to the valve stem. When it fuses, you should be able to remove it using one of the techniques for removing a stuck handle,...