Conval forged high-pressure valves: Clampseal globe, Camseal ball and Swivldisc gate valves

Conval forged valves through ASME Class 4500: globe, check, bellows seal and throttling valves, ball and gate valves. Selection by pressure class and material, quotation per project.

Clampseal globe valves: Y, angle and T-pattern

Conval Clampseal globe valves come in three body styles, Y, angle and T-pattern, in ASME pressure classes through 4500 and sizes through 4 inches. Packing is corrosion-inhibited, high-density graphite. Parts are interchangeable, so a whole plant runs on a small parts inventory.

ASME Class through 4500
Sizes through 4 inches
Y, angle and T bodies
Over 30 alloys supplied

Camseal top entry ball valves

Conval Camseal top entry ball valves are repaired in line, with no cutting out of the pipe and no special tools. The metal seat carries a chrome carbide coating and holds nitrogen at 50 and 1,000 psi at the final factory seat test. Bearings support the stem above and below the packing.

ASME Class through 4500
Chrome carbide metal seat
ISO 5211 mounting pad
Seat test at 1,000 psi nitrogen

Swivldisc flexible wedge gate valves

Conval Swivldisc gate valves use a flexible disc that lets the seating surfaces align and reduces the risk of thermal binding. The pressure seal bonnet gives service access with no welds to cut and no gaskets to replace. The one-piece gland with integral wrench adjusts at any time.

ASME Class 900–2500
Sizes through 4 inches
WCB and CF8M bodies
API 624 compliance

Clampseal piston and ball check valves

Conval Clampseal check valves protect high-pressure lines against reverse flow where light weight and compact size matter. The valve has five assemblies, and only the piston and the Inconel X spring move. Versions include piston, ball and stop check.

ASME Class through 4500
Sizes through 4 inches
Inconel X spring
Two moving parts

MSS SP-117 bellows seal valves

Conval bellows seal valves remove the stem and stuffing box leak paths and are used where packed valves may not contain light gases or hazardous fluids. The 6-ply welded bellows is tested with a helium mass spectrometer. Seats and discs are solid cobalt-chrome.

ASME Class through 2500
6-ply welded bellows
Helium leak test
Cobalt-free option

Clampseal throttling valves with removable seat

Conval Clampseal throttling valves give repeatable flow control and dependable shutoff. The venturi is part of the removable seat and changes in line after wear or when a different flow characteristic is needed. The stem assembly is mated to the orifice and is also easy to change.

ASME Class through 4500
Sizes through 4 inches
Removable seat and venturi
Stem position indicator

Blowdown valves and Whisperjet letdown devices

Conval Clampseal unit tandem valves serve boiler bottom blowdown, steam drains and high-pressure letdown. The naval boiler blowdown valve is qualified to MIL-V-17737. The Whisperjet reduces steam pressure in stages, with four to six orifices in each section.

Tandem: ASME through 4500
Naval: MIL-V-17737
Whisperjet: 4–6 orifices
Hard or soft seat

Packing, stem and disc assemblies, repair tools

Conval Clampseal packing sets combine two double-height die-formed graphite rings with braided end rings. In-line repair uses Conval tools: a repacking tool, a seat refacing tool and lapping tools. Parts and tools are matched by size code, and the tool kit is also available for rent.

Graphite: -325F to 1200F
Die-formed and braided rings
Parts by size code
Tool kit available for rent

How to choose a Conval valve

Selection starts with valve type and pressure class.

Conval makes forged high-pressure, high-temperature valves in sizes through 4 inches: Clampseal globe valves with Y, angle and T bodies in ASME classes through 4500, Camseal ball valves, Swivldisc gate valves, check, bellows seal and throttling valves, and strainers.

Next come body material and ends. Standard forgings are A105, F22, F91 and F316, and valves have been supplied in over 30 alloys. Ends include butt weld, socket weld, NPT threads, ASME flanges and Grayloc.

Severe service valves

Bellows seal valves to MSS SP-117, through ASME Class 2500, go where packing may not contain light gases or hazardous fluids. Urea service valves are built for high-pressure piping of urea reactors, strippers and condensers, in sizes through 6 inches and classes through ASME 2500.

Cryogenic valves in forged F316 stainless steel meet ASME B31.3. The naval boiler blowdown valve is qualified to MIL-V-17737, and unit tandem valves handle boiler bottom blowdown and high-pressure letdown.

In-line servicing

The Clampseal design allows complete repair in line: seat and disc refacing and lapping, and replacement of the bonnet chamber assembly with its packing. The pressure seal bonnet gives access with no welds to cut and no gaskets to replace.

The size code on the body defines parts and tools. The manufacturer publishes service instructions for globe, ball and throttling valves, gate valves and strainers.

Strainers and steam letdown

Clampseal strainers come in angle, Y and T configurations with element hole sizes from 1/32 to 1/8 inch. The strainer is easily taken apart for element cleaning or change out.

The Whisperjet reduces steam pressure in stages, with four to six orifices in each section, and the number of stages is matched to the flow.

The manufacturer

Conval, Inc. has made severe service valves since 1967; the valves are still manufactured in Connecticut, with headquarters in Enfield.

Sales run through a network of distributors and sales agents. Sizes and lead time are stated in the quotation for each project.

Conval and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of Conval and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.