Depending on the shape of the lock or regulator brass ball valves are divided into the cone and ball.

Gland cone valves provide better protection against leakage of the working environment in the atmosphere (due to gland), but have quickly wear element – the soft packings, which requires more frequent servicing.

Benefits of cranes with tie through the thread is simple design, as well as the convenience of tightening force adjustment. Practice of their operation has shown that to achieve the desired tightness required considerable tension tube and virtually every opening or closing these valves must be accompanied by a weakening or strengthening of the tension tube.

For relatively large port areas, in particular for gas boilers PTVM and cast-iron sectional boilers, used cranes, lubricated stuffing that fills the microscopic treatment of contact surfaces shell and tube, thus providing additional sealing. Ceteris paribus gland cranes have greater integrity than the stretch, and cranes with a lubricant – more integrity than the gland.

Over the past 10 years there was an alternative to traditional valves and brass ball valves – brass ball valves. They are issued by domestic and foreign firms. To connect to the pipes used welding or flanges. Typically, brass ball valves with a diameter of 150 mm operates with manual drive, and a larger diameter valves – with gear, hydro (pneumatic) or electric. Housed in the body of the body in the form of a ball made from brass or stainless steel. On both sides of the ball adjacent to the O-rings of Teflon or stainless steel alloys, abrasion and impacts of pollution. Belleville spring seal is pressed to a floating ball and ensure reliable operation of the crane at low and high temperatures.

It should be noted that the brass ball valves have a temperature limit of no more than 200 º C, which is dictated by the properties used in the soft sealing gate.
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