Taper Single Plug Valves

Valve Construction/Design

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The PR lubricated taper plug valve group 5 is the ideal shut off device for almost any medium, even under the most severe operating conditions.It can be used in most places where fast, trouble-free and efficient sealing is required.

The design is very compact, it requires little space to install and can be mounted in any position required.

The PR lubricated taper plug valve group 5 is the ideal shut off device for almost any medium, even under the most severe operating conditions.It can be used in most places where fast, trouble-free and efficient sealing is required.The design is verycompact, it requires little space to install and can be mounted in any position required.

Since the only moving parts are the plug and the stem, the basic operation of the PR valve is very simple. When the plug is turned 90o, the valve moves from closed to open position – and vice versa. The plug is tapered 1:6 and is individually fitted to the valve body with very close tolerances.

It incorporates Metal to Metal sealing, which means that no soft seal will be damaged by the flowing medium.As a secondary seal, the valve is provided with a lubrication system which allows feeding a special lubricant into the valve while the valve is in operation.

Besides sealing, the purpose of the lubricant is to protect the internals of the valve against corrosion and wear as well as reducing the valve torque.

The valve is manufactured in the ”Pressure Balanced Design” this means that the plug is provided with pressure balance holes which ensure that the plug is always in axial balance and consequently prevents the plug from taper locking. Furthermore, in order to reduce the valve torque, the surface of the (tapered) plug is coated with P.T.F.E.

The plug and the operating stem are two separate parts which are connected by means of an equalizer ring acting as universal joint. The stem is Blowout-proof. This means the only way to remove it is from the bottom after valve is disassembled