Restriction Orifice Unions
1/4" to 2" Socket-Weld or Female NPT Threads Restriction Orifice Unions Bored to Your Specifications
Restriction Orifice Unions are common in industries such as oil and gas, chemical processing, and power generation, where precise flow control and pressure management are essential. They feature one-piece stainless steel orifice plates shaped to match the union seat (ball to cone), eliminating the need for gaskets. The plates can be configured as recessed, pressed, or pressed with a tab, allowing easy identification of the orifice size without disassembling the union.
RESTRICTION ORIFICE UNION PRODUCT FEATURES:
- Designed for simple plate replacement
- Available in both Female NPT and socket-weld connections
- Seals will not loosen, even under extreme pressure
- Available with or without tabs for easy identification
- In-stock items ship within 24 hours
These unions are stocked in carbon and stainless steel bodies with pressure ratings of 3,000 PSIG. They come in line sizes ranging from 1/4" to 2" and offer female NPT or socket-weld connections. Non-standard sizes and materials are quickly produced upon request.
While orifices are typically bored based on your sizing calculation, we also offer sizing calculation services for a minimal fee. All orifice plates are stainless steel by default but can be ordered separately or combined with our restriction orifice unions.
NEED A BORE CALCULATION?
Let USA Industries' engineers calculate the correct bore size based on process data for the project.
Restriction Orifice Union Sizing Chart |
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|---|---|---|---|
| Size | A | B | C |
| 1/4" | 1 3/4" | 1/4" | 1 3/8" |
| 3/8" | 1 7/8" | 3/8" | 1 5/8" |
| 1/2" | 2" | 1/2" | 1 3/4" |
| 3/4" | 2 1/4" | 3/4" | 2 3/16" |
| 1" | 2 9/16" | 1" | 2 9/16" |
| 1 1/4" | 2 7/8" | 1 1/4" | 3 1/16" |
| 1 1/2" | 3 1/8" | 1 1/2" | 3 7/16" |
| 2" | 3 1/2" | 2" | 4" |
All Sizes in Inches
Note: USA Industries, Inc.'s orifice bore calculation service is provided on a professional fee basis.
Series 500, 520, 560, 590 & Restriction Union
Line Sheet
Frequently Asked Questions
Yes, we sell all 3 types of plates that can be bored to customer specs or as a blank plate.
No, there is also #6000 available, upon request.
This would depend upon your application, and the decision must be made by the customer.
Yes, female NPT and socket-weld connections are both available upon request.
Yes, we typically use the bore calculations provided to us by the customer, but we can do the bore calculations upon request for a small additional fee.
We stock our orifice plates in 304 & 316 stainless steel, but they are available in any material requested. We have produced orifice plates for clients in everything from monel to hastelloy to copper-nickel alloys and more!
Yes, we regularly coat our orifice plates for customers that request it. Just let us know what you need and we'll take care of you!
We're a manufacturer, completely capable to customizing or rushing an order through our facility to meet your deadlines. Between our rapid production abilities and massive in-stock inventories, we believe we can hit almost any deadline you require.