{"id":1391,"date":"2017-06-19T22:28:12","date_gmt":"2017-06-19T22:28:12","guid":{"rendered":"http:\/\/www.avcovalve.com\/avcovalve\/?post_type=product&p=1391"},"modified":"2024-05-02T22:59:26","modified_gmt":"2024-05-02T22:59:26","slug":"restriction-union","status":"publish","type":"product","link":"https:\/\/avcovalve.com\/avcovalve\/product\/restriction-union\/","title":{"rendered":"Restriction Unions"},"content":{"rendered":"

Restriction unions are used in piping systems for sizes typically less than 2\u201d where the use of flanges is prohibitive or unavailable and are used to restrict pressure or flow.\u00a0 AVCO supplies these unions for female NPT, male NPT, socket weld, compression and AN fitting connections.\u00a0 Female restriction unions (NPT & socket weld) have replaceable orifice plates which can be used for pressure restriction in gas or liquid systems.\u00a0 For choked flow, it is often overlooked that standard restriction unions are not sufficient. AVCO has in-depth knowledge of flow restriction and has developed many different styles to ensure flow is properly restricted.\u00a0 For gases, the throat length must be between 1 and 6 times the orifice bore for critical\/choked flow to occur.\u00a0 In liquids choked flow will occur across a standard plate, but cavitation due to the high pressure drop and resultant temporary drop below the liquid vapor pressure, will cause noise and possible damage to the upstream piping.\u00a0 To alleviate this the throat length should be in the region of 6 times the orifice bore thus containing the cavitation zone and eliminating the requirement for frequent replacement.\u00a0 AVCO offers several specialized restriction unions to enable greater throat lengths in both tubing and piping systems to give reliable protection of your critical equipment.<\/p>\n","protected":false},"excerpt":{"rendered":"

Size:<\/strong><\/span><\/h3>\n

1\/4\u201d through 2\u201d<\/p>\n

Class:<\/strong><\/span><\/h3>\n

3000# and 6000#<\/p>\n

Style:<\/strong><\/span><\/h3>\n

Concentric<\/p>\n

Connection:<\/strong><\/span><\/h3>\n

Socket Weld, Threaded NPT<\/p>\n

Material:<\/span><\/strong><\/h3>\n

316 Stainless Steel, Carbon Steel<\/p>\n","protected":false},"featured_media":1431,"template":"","meta":[],"product_brand":[],"product_cat":[26],"product_tag":[],"class_list":{"0":"post-1391","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-uncategorized","7":"post","8":"post-with-thumbnail","9":"post-with-thumbnail-large","11":"first","12":"instock","13":"shipping-taxable","14":"product-type-simple"},"yoast_head":"\nRestriction Unions - Avcovalve<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/avcovalve.com\/avcovalve\/product\/restriction-union\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Restriction Unions - Avcovalve\" \/>\n<meta property=\"og:description\" content=\"Size: 1\/4\u201d through 2\u201d Class: 3000# and 6000# Style: Concentric Connection: Socket Weld, Threaded NPT Material: 316 Stainless Steel, Carbon Steel\" \/>\n<meta property=\"og:url\" content=\"https:\/\/avcovalve.com\/avcovalve\/product\/restriction-union\/\" \/>\n<meta property=\"og:site_name\" content=\"Avcovalve\" \/>\n<meta property=\"article:modified_time\" content=\"2024-05-02T22:59:26+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/avcovalve.com\/avcovalve\/wp-content\/uploads\/2017\/06\/Restriction-Union-web-image.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"1200\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/avcovalve.com\/avcovalve\/product\/restriction-union\/\",\"url\":\"https:\/\/avcovalve.com\/avcovalve\/product\/restriction-union\/\",\"name\":\"Restriction Unions - 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