{"id":42,"date":"2023-08-29T12:35:34","date_gmt":"2023-08-29T12:35:34","guid":{"rendered":"http:\/\/www.bqscn.com\/?p=42"},"modified":"2025-04-08T06:27:28","modified_gmt":"2025-04-08T06:27:28","slug":"valve","status":"publish","type":"post","link":"http:\/\/www.bqscn.com\/index.php\/2023\/08\/29\/valve\/","title":{"rendered":"Valve"},"content":{"rendered":"<p><strong>What is the Valve?<\/strong><\/p>\n<p>Valves are used in many safety-critical applications, such as in the oil and gas industries. Like many other industrial products. In this Article we want to let you know what is important to purchase valve and waht items need to be inspected for this equipment.<\/p>\n<p>There are many factors to consider when you want to purchase valves, such as the type of valve (including ball valves, gate valves, globe valves, check valves, and butterfly valves), size, material corrosion resistance, and heat tolerance. we suggest\u00a0 to be sure about the factors below before purchasing:<\/p>\n<ul>\n<li><strong>Manufacturing:<\/strong>\u00a0 Always ask the supplier about the origin of the valve.<\/li>\n<li><strong>Certifications:<\/strong> You should Look for recognized standards like ANSI, API, ASTM, or ISO to ensure the valve meets quality standards.<\/li>\n<li><strong>Material Test Certificate:\u00a0<\/strong>Verify the material test certificate for details such as chemical composition, mechanical properties, and other relevant information.<\/li>\n<\/ul>\n<p><strong>During the manufacture of the valve:<\/strong><\/p>\n<p>During the manufacturing you need to check the valve process to prevent any matters in this time. the valves must be inspected thoroughly in the manufacturer\u2019s shop to ensure proper quality. BQS as a third party inspection company is here to help you for a goods quality inspection.<\/p>\n<p>Normally the following tests and examinations are performed on Valves\/Components:<\/p>\n<ul>\n<li>Shell Test<\/li>\n<li>Backseat Test<\/li>\n<li>Low and high-pressure closure test<\/li>\n<li style=\"background: white;\"><span style=\"font-size: 14.0pt; font-family: 'Calibri',sans-serif; color: #2d3748;\"><span style=\"color: #2d3748; text-decoration: none; text-underline: none;\">Double block and bleed (DBB)<\/span>\u00a0high-pressure closure test<\/span><\/li>\n<li style=\"background: white;\"><span style=\"font-size: 14.0pt; font-family: 'Calibri',sans-serif; color: #2d3748;\">Visual examination of castings<\/span><\/li>\n<li style=\"background: white;\"><span style=\"font-size: 14.0pt; font-family: 'Calibri',sans-serif; color: #2d3748;\">High-pressure pneumatic shell test<\/span><\/li>\n<li style=\"background: white;\"><span style=\"font-size: 14.0pt; font-family: 'Calibri',sans-serif; color: #2d3748;\">Codes and Standards for Valve Inspection and Testing<\/span><\/li>\n<\/ul>\n<p><strong>Shell Test<\/strong><\/p>\n<p style=\"text-align: left;\">Shell test is required for all valve types. This is actually a\u00a0pressure test where normally air, inert gas, water, kerosene, etc can be used as the test fluid. The minimum shell test pressure that can use are listed in table 2 of API-598 standard. The pressure is applied inside the assembled valve with the ends closed. The valve will be partially open and be able to hold pressure for a certain time and the important thisng is that\u00a0 pressure should not be less than 1.5 times of maximum working pressure. There is also not have\u00a0 the leakage.<\/p>\n<p>&nbsp;<\/p>\n<p><img data-recalc-dims=\"1\" fetchpriority=\"high\" decoding=\"async\" data-attachment-id=\"49\" data-permalink=\"http:\/\/www.bqscn.com\/index.php\/2023\/08\/29\/valve\/picture1\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/Picture1.jpg?fit=793%2C595\" data-orig-size=\"793,595\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Picture1\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/Picture1.jpg?fit=300%2C225\" data-large-file=\"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/Picture1.jpg?fit=793%2C595\" class=\"size-medium wp-image-49 aligncenter\" src=\"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/Picture1.jpg?resize=300%2C225\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/Picture1.jpg?resize=300%2C225 300w, https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/Picture1.jpg?resize=768%2C576 768w, https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/Picture1.jpg?w=793 793w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/>\u00a0 \u00a0 \u00a0 <img data-recalc-dims=\"1\" decoding=\"async\" data-attachment-id=\"50\" data-permalink=\"http:\/\/www.bqscn.com\/index.php\/2023\/08\/29\/valve\/picture2\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/Picture2.jpg?fit=765%2C574\" data-orig-size=\"765,574\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Picture2\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/Picture2.jpg?fit=300%2C225\" data-large-file=\"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/Picture2.jpg?fit=765%2C574\" class=\"size-medium wp-image-50 aligncenter\" src=\"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/Picture2.jpg?resize=300%2C225\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/Picture2.jpg?resize=300%2C225 300w, https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/Picture2.jpg?w=765 765w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<ul>\n<li><span style=\"color: #808080;\"><em>Shell Test- No leakage check<\/em><\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><strong>Backseat Test<\/strong><\/p>\n<p>Required for all valves that have the backseat feature, except for bellows seal valves. This is a feature that allows valve packing to be replaced while it is in service. Normally\u00a0gate valves,\u00a0globe, and parallel slide gate valves are subjected to this test. This pressure test is performed to verify leakage past the stem or shaft to the bonnet seal i.e, backseat. Table 3 of API-598 provides the required test pressures for the backseat test for different valve types. In this test, the valve shall be fully opened and the packing gland shall be loose or not installed. No leakage is permissible in the backseat test.<\/p>\n<p>&nbsp;<\/p>\n<p><img data-recalc-dims=\"1\" decoding=\"async\" data-attachment-id=\"46\" data-permalink=\"http:\/\/www.bqscn.com\/index.php\/2023\/08\/29\/valve\/shell-test-backseat-test\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/shell-test-backseat-test.jpg?fit=765%2C574\" data-orig-size=\"765,574\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"shell test- backseat test\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/shell-test-backseat-test.jpg?fit=300%2C225\" data-large-file=\"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/shell-test-backseat-test.jpg?fit=765%2C574\" class=\"size-medium wp-image-46 aligncenter\" src=\"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/shell-test-backseat-test.jpg?resize=300%2C225\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/shell-test-backseat-test.jpg?resize=300%2C225 300w, https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/shell-test-backseat-test.jpg?w=765 765w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><strong>Low-pressure closure test\/ High-pressure closure test<\/strong><\/p>\n<p>Closure tests are performed to confirm leakage past or through a valve\u2019s closure mechanism. The Closure Test or Valve Seat Leak Test is performed after the successful completion of the Valve Body Test\/shell test. One side of the valve inlet or outlet shall be subjected to the hydrostatic pressure and the amount of leak shall be measured on the opposite side of the valve<\/p>\n<p>To explain it, if you are pressurizing the valve inlet, then you have to measure the amount of leakage in the outlet. For both low-pressure and high-pressure tests leakage through the disc, behind the seat rings, or past the shaft seals is not permitted. However, a limited amount of leakage is permissible at the seat-sealing surface interface which is listed in table 5 of API-598.<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"44\" data-permalink=\"http:\/\/www.bqscn.com\/index.php\/2023\/08\/29\/valve\/high-pressure-test\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/high-pressure-test.jpg?fit=531%2C398\" data-orig-size=\"531,398\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"high pressure test\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/high-pressure-test.jpg?fit=300%2C225\" data-large-file=\"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/high-pressure-test.jpg?fit=531%2C398\" class=\"size-medium wp-image-44 aligncenter\" src=\"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/high-pressure-test.jpg?resize=300%2C225\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/high-pressure-test.jpg?resize=300%2C225 300w, https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/high-pressure-test.jpg?w=531 531w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><strong>Double block and bleed (DBB)\u00a0high-pressure closure test<\/strong><\/p>\n<p>Pressure shall be applied successively to each side of the closure and Leakage into the body cavity shall be checked.<\/p>\n<p><strong>Visual examination of castings<\/strong><\/p>\n<p>A visual examination must be performed on all castings to ensure conformance with\u00a0MSS SP-55.<\/p>\n<p><strong>High-pressure pneumatic shell test<\/strong><\/p>\n<p>A high-pressure pneumatic shell test should be performed after the shell test, using appropriate safety precautions. The pneumatic shell test pressure shall be 110 % of the maximum allowable pressure at 38 degrees C (100 degrees F) or as specified in the purchase order. Visible leakage is not allowed<\/p>\n<p>Table 1 of API 598 specifies the pressure test requirements for various types of Valves. The test equipment should not apply external forces that affect seat or body seal leakage. The following figure shows some sample test equipment used for valve testing<\/p>\n<p><strong>Codes and Standards for Valve Inspection and Testing<\/strong><\/p>\n<p>Valve inspection and testing must be performed for the smooth and safe operation of industrial processes. Major codes and standards that guide the inspection and testing procedure of a valve are<\/p>\n<ul>\n<li>API 598<\/li>\n<li>API 607<\/li>\n<li>API 6D<\/li>\n<li>BS 759<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>What is the Valve? Valves are used in many safety-critical applications, such as in the oil and gas industries. Like many other industrial products. In this Article we want to&hellip;<\/p>\n","protected":false},"author":1,"featured_media":48,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[14],"tags":[10],"class_list":["post-42","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bqs-blog","tag-valve"],"aioseo_notices":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/Valve.jpg?fit=751%2C563","jetpack-related-posts":[{"id":52,"url":"http:\/\/www.bqscn.com\/index.php\/2023\/08\/29\/valveinspection\/","url_meta":{"origin":42,"position":0},"title":"Valve inspection","author":"bqscn","date":"August 29, 2023","format":false,"excerpt":"Valve Inspection Third-party valve inspection is normally arranged by the purchaser, and the representative from the third-party inspection agency. Usually, a list of documents is required to review by valve inspector, including: Purchase Order of the Valve Data Sheet of the Valve Manufacture Quality Control Plan Inspection and Test plan\u2026","rel":"","context":"In &quot;Blog&quot;","block_context":{"text":"Blog","link":"http:\/\/www.bqscn.com\/index.php\/category\/bqs-blog\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/Valve-inspection.jpg?fit=556%2C622&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/Valve-inspection.jpg?fit=556%2C622&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/Valve-inspection.jpg?fit=556%2C622&resize=525%2C300 1.5x"},"classes":[]},{"id":1195,"url":"http:\/\/www.bqscn.com\/index.php\/2024\/10\/23\/grinding-wheels-inspection\/","url_meta":{"origin":42,"position":1},"title":"Grinding Wheels Inspection","author":"bqscn","date":"October 23, 2024","format":false,"excerpt":"Grinding Wheels- Dis balance value Grinding Wheels- Dis balance value Grinding Wheels- Hardness Test Grinding Wheels- Hardness test Grinding Wheels- Dimension Check Grinding Wheels- Packing inspection Grinding Wheels- Safety test Grinding Wheels- Safety test BQS-Inspection-Grinding Wheels","rel":"","context":"In &quot;Blog&quot;","block_context":{"text":"Blog","link":"http:\/\/www.bqscn.com\/index.php\/category\/bqs-blog\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2024\/10\/DSCN5239.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2024\/10\/DSCN5239.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2024\/10\/DSCN5239.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":8,"url":"http:\/\/www.bqscn.com\/index.php\/2023\/08\/29\/third-party-inspection\/","url_meta":{"origin":42,"position":2},"title":"Third Party inspection","author":"bqscn","date":"August 29, 2023","format":false,"excerpt":"\u00a0 What is the Third-Party Inspection: A\u00a0Third-Party Inspection, or TPI, is the term used for independent impartial inspection services provided by a qualified company. They will send out the inspection team to the factory to conduct quality inspections and conduct a series of testing on the products to check if\u2026","rel":"","context":"In &quot;Blog&quot;","block_context":{"text":"Blog","link":"http:\/\/www.bqscn.com\/index.php\/category\/bqs-blog\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/7-Photo-Edit-01.jpg?fit=1200%2C802&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/7-Photo-Edit-01.jpg?fit=1200%2C802&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/7-Photo-Edit-01.jpg?fit=1200%2C802&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/7-Photo-Edit-01.jpg?fit=1200%2C802&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.bqscn.com\/wp-content\/uploads\/2023\/08\/7-Photo-Edit-01.jpg?fit=1200%2C802&resize=1050%2C600 3x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"http:\/\/www.bqscn.com\/index.php\/wp-json\/wp\/v2\/posts\/42","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.bqscn.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.bqscn.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.bqscn.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.bqscn.com\/index.php\/wp-json\/wp\/v2\/comments?post=42"}],"version-history":[{"count":2,"href":"http:\/\/www.bqscn.com\/index.php\/wp-json\/wp\/v2\/posts\/42\/revisions"}],"predecessor-version":[{"id":521,"href":"http:\/\/www.bqscn.com\/index.php\/wp-json\/wp\/v2\/posts\/42\/revisions\/521"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.bqscn.com\/index.php\/wp-json\/wp\/v2\/media\/48"}],"wp:attachment":[{"href":"http:\/\/www.bqscn.com\/index.php\/wp-json\/wp\/v2\/media?parent=42"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.bqscn.com\/index.php\/wp-json\/wp\/v2\/categories?post=42"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.bqscn.com\/index.php\/wp-json\/wp\/v2\/tags?post=42"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}