The trapezoidal shape is said to eliminate the possibility of the O-ring popping out, unlike standard round-shape O-rings that rely on being pinched by the groove retaining ring for seal retention.

But this doesn't always work and O-rings can pop out. The Trap-Seal, a trapezoidal O-ring from Parker Hannifin Tube Fittings Div. (parker.com/tfd), eliminates this ...

Sustainability needs to go further beyond inspiring speeches and promises, with visible, concrete actions. In order to see this change, it is essential for individuals, companies and governments to ...

Figure 1 You can implement this velocity-profile section in software that you can use to provide digital or analog motor control. Figure 2 You use subtraction to calculate the area under the curve ...