All About PVC Flanges
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Time to read 4 min
Piecing together a connection with flanges can be tough. Do you use a bolt kit or stud pack? Do you always use a gasket? At PVC Fittings Online we get it. We understand the frustration that comes with installing a flange, which is why we our team is equipped with the knowledge of the flange.
Take a look at the type of flanges we offer:
Slip Flange
This flange allows an easy connection with solvent cement. The flange provides the perfect fit by slipping over the pipe. There are two types of slip flanges: one-piece and Van Stone. One piece flanges are solid molded parts. They require care when installing because the flange cannot be turned once glued into the pipe line.
Van Stone Flange
This is a two piece flange with a rotating ring that makes bolt alignment simple. Comes in slip and spigot styles to suit your application.
Threaded Flange
These flanges do not require solvent cement for installation. This flange has one female threaded end to connect to a male threaded fitting or nipple.
Spigot Flange
While slip flanges fit over PVC or CPVC pipe, spigot flanges fit into a PVC or CPVC fitting. These are great for giving a slip fitting a flanged end. Like slip flanges, these require solvent cement for installation.
Blind Flange
When a system flow needs to be stopped, the blind flange is the one for the job. These flanges do not connect to the pipe line in any glued or threaded fashion. They are simply bolted in place to another flanged connection. The effect is a sealed off end to that pipe line.
Creating the Proper Connection:
Flange on Flange
When creating the connection with two flanges, you must have a gasket and bolt kit. The recommended gasket to use is the full face EPDM gasket. Choose from zinc and stainless steel bolt materials depending on your application. Stainless steel is often used in outdoor environments whereas zinc is a less expensive, yet more corrosive material. When purchasing from PVC Fittings Online, the bolt kit and gasket will be categorized as the same size as the flange. The bolt kit comes with all the fasteners you need to connect flanges.
Flange, Valve, Flange
In situations with mounting a valve between flanges, you will need a gasket (for non-wafer style valves) and a stud pack. The stud packs are also available in zinc and stainless steel. The stud packs come with studs, washers, and nuts to provide a tight hold.
Without knowing what type of flange you need and what seals and fasteners are required, it can be tough to plan for a project. If you feel overwhelmed or frustrated with a PVC project you’re planning, feel free to call us at PVC Fittings Online for help!
Variations Serve Specific Installation Needs: PVC flanges come in various functional designs—Slip and Spigot flanges (solvent welded), Threaded flanges (no glue needed), Van Stone flanges (rotating ring for easy bolt alignment), and Blind flanges (solid caps to seal off pipe runs).
Flange-to-Flange Connections Require Gaskets & Bolt Kits: Connecting two flanges together requires an EPDM full-face gasket for a tight seal alongside a dedicated bolt kit (available in zinc for general use or stainless steel for corrosion resistance).
Valves Require Stud Packs: When mounting a non-wafer valve between two flanges, stud packs (containing studs, washers, and nuts) are used instead of standard bolt kits to secure the assembly properly.
FAQs
What is the difference between a Slip Flange and a Van Stone Flange?
Slip Flange: A solid, one-piece molded flange that glues directly over a PVC pipe. Because it is a single piece, it cannot be rotated once installed, requiring precise alignment during gluing.
Van Stone Flange: A two-piece flange featuring a separate, rotating outer ring. This allows you to align the bolt holes easily even after the inner fitting has been glued into the pipeline.
When should I use a Blind Flange?
A blind flange is used when you need to completely stop or cap the flow at the end of a piping system. It has no inner opening or pipe connection—it simply bolts onto another flanged end with a gasket to create a sealed, temporary or permanent termination point.
What hardware and accessories are required to connect two flanges together?
To join two flanges, you need:
A full-face gasket (such as an EPDM gasket) placed between the flange faces to form a watertight seal.
A Bolt Kit (containing bolts, nuts, and washers). You can choose Zinc for cost-effective indoor/standard applications, or Stainless Steel for corrosion resistance in outdoor or wet environments.
How do I install a valve between two flanges?
When mounting a non-wafer valve between two flanged connections, you will need a gasket and a Stud Pack (threaded studs, nuts, and washers) rather than a standard bolt kit to properly secure and sandwich the valve between the flanges.
Mark Ligon
Mark Ligon is the marketing manager at PVC Fittings Online, a supplier of commercial PVC and CPVC pipe, fittings and valves. Ligon enjoys educating businesses on the parts of piping systems so managers can make informed decisions. He can be reached at webmaster@commercial-industrial-supply.com.
