Valves

A stop valve typically involves a soft element (lead, PTFE, rubber, etc.) that conforms to a harder seat, thereby closing tightly (complete stoppage of flow). A needle valve is typically of hard materials that withstand high flow velocities through small cross sections; but the hard surfaces may not seal perfectly tight when closed.

If you're Sharon at Teyi Valves, why not ask somebody in your company?

Codey

Stop valves are intended just to shut off the flow. They can have resilient seat or metal to metal seat and be of different construction/type (gate, globe, butterfly....)

Needle valve is a special type of globe like valve whose plug have a "needle like end" and are specially designed to control flow (obviously they can isolate it and become momentarily a "stop" valve).

Bend cold: to bend a pipe at room temperature. NOTE: 10" diameter seems to high to cold bend it without wrinkling. Too much force required as well. Such diameters are usually hot bended.

40D: When taking about pipe bends it's usual to specify the bending radius and angle. In this case it seems a 90º bend with a radius 40 times the diameter (quite unusual too). The bending radius is measured over the centerline of the pipe.

It seems a specification for a tailored pipe elbow (not a pipe fitting because 90º elbows have usually much shorter bending radius and as they are standard the normal designation is LR, Long Radius, and SR, Short Radius)

I've said "elbow" because no length is specified and the addition to the specification of the "BW" (Butt weld ended) and the thickness (Sch. 40).

Kind regards

Thanks for your answer about my questions.

My techinists have answered my questions.

If someone needs valves or questions, welcome to contact me for free.

For products, welcome to review www.teyivalve.com

For inquiries, welcome to contact me for free. Sharon@teyivalve.com