Throttling Valve Brochure

Throttling Valve

Conval Clampseal® Throttling Valves are designed for a wide range of severe service applications requiring repeatable flow control and dependable shutoff.

Standard Sizes

Sizes through 4″

Pressure Rating

ASME Class through 4500 #

Standard Forging ASME Materials

SA 105, SA 182-F22, SA 182-F91, SA 182-F92, SA 182-F316
Other materials available upon request


Actuators – Air, Motor, Hydraulic
Limitswitch – Single or double
Locking Devices – open, closed, or both
Position Indicator
Stem Shroud

Throttling Valve Design Features

Replaceable 4400 Stainless Steel Seat/Venturi

The venturi is an integral part of the removable seat. It is easily changed in-line should different flow characteristics be required or replacement be necessary from excessive wear. The orifice is sized to keep fluid velocity across the seat below damaging levels. The exit orifice angle is designed to minimize downstream piping erosion and noise. Several erosion-resistant materials are available. Consult factory.

Position Indicator

The position indicator is easy to read and an accurate indication of valve stem position.

Axially-loaded Packing System

The Axial design ensures tight concentricity, which eliminates side loading of the packing and minimizes wear forces on the trim components. This feature is critical for superior valve performance.

Mated Stem Assembly

The stem assembly is mated to the orifice for proper control. Like the orifice seat assembly, it is easily changeable should different flow characteristics be required or excessive erosion or corrosion be a problem.

Pressure Seal Bonnet

The simple and effective pressure seal bonnet provides ready access for servicing with no welds to cut or seal rings or gaskets to replace. The body-to-bonnet joint integrity is maintained through countless thermal cycles.

Single-piece Gland

In extreme environments, the simpler the design and the fewer the parts, the better. The durable single-piece stainless steel gland contributes to the longevity of the valve.

Pressure-Actuated Backseat

The Clampseal® pressure-actuated backseat provides maximum valve integrity by ensuring a positive internal stop for the valve stem and disc assembly. The pressure actuated backseat also extends packing life by securely isolating the packing from the pressure when the valve is fully open.

Rapid In-Line Renewability

The CLAMPSEAL® Throttling Valve is much easier to renew than anything else on the market. The CLAMPSEAL® Valve line provides a modular solution to rising maintenance expenses. Low acquisition cost is not as important as low cost over the serviceable life of a valve. Maintaining a Conval valve is far easier and much less costly than replacing a competitor’s valve.