{"id":8848,"date":"2026-01-17T21:31:13","date_gmt":"2026-01-17T13:31:13","guid":{"rendered":"https:\/\/www.stvvalves.com\/?post_type=product&p=8848"},"modified":"2026-06-21T09:25:15","modified_gmt":"2026-06-21T01:25:15","slug":"f20-api-602-check-valve-1-inch-class-150-lb-flanged-end","status":"publish","type":"product","link":"https:\/\/www.stvvalves.com\/ar\/products\/f20-api-602-check-valve-1-inch-class-150-lb-flanged-end\/","title":{"rendered":"F20 API 602 Check Valve, 1 Inch, Class 150 LB, Flanged End"},"content":{"rendered":"

F20 API 602 Check Valve, 1 Inch, Class 150 LB, Flanged End<\/h1>\n

ASTM A182 F20 Forged Steel Check Valve for High-Temperature and Refinery Service<\/h2>\n

The ASTM A182 F20 API 602 Check Valve<\/a>, 1 Inch, Class 150 LB, Flanged End<\/strong> is a compact forged alloy steel non-return valve designed to automatically prevent reverse flow in high-temperature and moderate-pressure piping systems. Manufactured from ASTM A182 F20 chromium-molybdenum alloy steel<\/strong>, the valve provides excellent creep resistance, oxidation resistance, and mechanical strength for demanding services in power plants, refineries, petrochemical facilities, and thermal oil systems.<\/p>\n

Designed and manufactured in accordance with API 602<\/strong><\/a>, ASME B16.34<\/strong>, ASME B16.5<\/strong>, and tested per API 598<\/strong>, this forged steel check valve offers dependable sealing performance and long service life under elevated temperatures.<\/p>\n

\n

Product Overview<\/h1>\n
\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Item<\/th>\nSpecification<\/th>\n<\/tr>\n<\/thead>\n
Product Name<\/td>\nForged Steel Check Valve<\/td>\n<\/tr>\n
Valve Type<\/td>\nSwing Check Valve<\/td>\n<\/tr>\n
Size<\/td>\n1 Inch (DN25)<\/td>\n<\/tr>\n
Pressure Rating<\/td>\nASME Class 150 LB<\/td>\n<\/tr>\n
Body Material<\/td>\nASTM A182 F20<\/td>\n<\/tr>\n
Bonnet Material<\/td>\nASTM A182 F20<\/td>\n<\/tr>\n
Disc Material<\/td>\nASTM A182 F20 + 13Cr<\/td>\n<\/tr>\n
Seat Material<\/td>\nIntegral Seat \/ Stellite Overlay Optional<\/td>\n<\/tr>\n
Connection Type<\/td>\nRF Flanged End<\/td>\n<\/tr>\n
Design Standard<\/td>\nAPI 602<\/td>\n<\/tr>\n
Flange Standard<\/td>\nASME B16.5<\/td>\n<\/tr>\n
Pressure-Temperature Rating<\/td>\nASME B16.34<\/td>\n<\/tr>\n
Inspection & Testing<\/td>\nAPI 598<\/td>\n<\/tr>\n
Applicable Media<\/td>\nSteam, Thermal Oil, Gas, Hydrocarbons<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
\n

Key Features<\/h1>\n

ASTM A182 F20 Alloy Steel Construction<\/h2>\n

F20 alloy steel contains chromium and molybdenum, providing:<\/p>\n

    \n
  • Excellent high-temperature strength<\/li>\n
  • Superior creep resistance<\/li>\n
  • Enhanced oxidation resistance<\/li>\n
  • Good thermal fatigue properties<\/li>\n
  • Long service life in elevated-temperature applications<\/li>\n<\/ul>\n

    This material is widely used in refinery and power generation industries.<\/p>\n

    \n

    API 602 Forged Steel Design<\/h2>\n

    Compared with cast valves, forged steel valves provide:<\/p>\n

      \n
    • Higher structural integrity<\/li>\n
    • Compact dimensions<\/li>\n
    • Better pressure resistance<\/li>\n
    • Reduced porosity<\/li>\n
    • Increased service life<\/li>\n<\/ul>\n

      API 602 valves are ideal for small-bore, critical process piping systems.<\/p>\n

      \n

      Automatic Reverse Flow Protection<\/h2>\n

      The swing disc design automatically opens and closes according to flow direction.<\/p>\n

      Advantages include:<\/p>\n

        \n
      • No external power required<\/li>\n
      • Low pressure loss<\/li>\n
      • Fast response<\/li>\n
      • Equipment protection<\/li>\n
      • Reduced maintenance requirements<\/li>\n<\/ul>\n
        \n

        RF Flanged End Connection<\/h2>\n

        Raised-face flanges provide:<\/p>\n

          \n
        • Reliable sealing<\/li>\n
        • Easy installation<\/li>\n
        • Convenient maintenance<\/li>\n
        • Compatibility with ASME B16.5 flanges<\/li>\n<\/ul>\n
          \n

          Technical Specifications<\/h1>\n

          Materials of Construction<\/h2>\n
          \n
          \n\n\n\n\n\n\n\n\n\n\n\n
          Component<\/th>\nMaterial<\/th>\n<\/tr>\n<\/thead>\n
          Body<\/td>\nASTM A182 F20<\/td>\n<\/tr>\n
          Bonnet<\/td>\nASTM A182 F20<\/td>\n<\/tr>\n
          Disc<\/td>\nASTM A182 F20 + 13Cr<\/td>\n<\/tr>\n
          Hinge Pin<\/td>\nF6a Stainless Steel<\/td>\n<\/tr>\n
          Seat<\/td>\nIntegral Seat \/ Stellite Optional<\/td>\n<\/tr>\n
          Gasket<\/td>\nSpiral Wound SS + Graphite<\/td>\n<\/tr>\n
          Bolting<\/td>\nASTM A193 B7 \/ A194 2H<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
          \n

          Applicable Standards<\/h2>\n
          \n
          \n\n\n\n\n\n\n\n\n\n\n
          Standard<\/th>\nDescription<\/th>\n<\/tr>\n<\/thead>\n
          API 602<\/td>\nForged Steel Valve Design<\/td>\n<\/tr>\n
          ASME B16.34<\/td>\nPressure-Temperature Ratings<\/td>\n<\/tr>\n
          ASME B16.5<\/td>\nFlanged Ends<\/td>\n<\/tr>\n
          API 598<\/td>\nInspection & Testing<\/td>\n<\/tr>\n
          MSS SP-25<\/td>\nValve Marking<\/td>\n<\/tr>\n
          NACE MR0175<\/td>\nOptional<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
          \n

          Working Principle<\/h1>\n

          The check valve operates automatically without manual intervention.<\/p>\n

          Forward Flow<\/h3>\n
            \n
          1. Fluid pressure pushes the disc open.<\/li>\n
          2. Flow passes through the valve.<\/li>\n
          3. Pressure drop remains minimal.<\/li>\n<\/ol>\n

            Reverse Flow<\/h3>\n
              \n
            1. Flow direction reverses.<\/li>\n
            2. The disc immediately returns to the closed position.<\/li>\n
            3. Backflow is prevented.<\/li>\n
            4. Pumps and upstream equipment are protected.<\/li>\n<\/ol>\n
              \n

              Typical Applications<\/h1>\n

              Oil Refineries<\/h2>\n

              Suitable for:<\/p>\n

                \n
              • Hydrocarbon process lines<\/li>\n
              • Utility piping<\/li>\n
              • Heat recovery systems<\/li>\n
              • High-temperature services<\/li>\n<\/ul>\n

                Refinery Application<\/h3>\n
                \n
                \n
                \n
                \"https:\/\/images.openai.com\/static-rsc-4\/FXUyGRhKvMGwHkYULHiviIHdU2DoSIKLC5tQoXqTdyvJ3e_em25JJhcmG6JAQpffID5mR474Bx2n3n-JytTVSfzFwH-iQkKl334XcrIhjKYThxmYM-_dpIB01lYm1Ssv6lKrBJbkcdAolj7OwzUF3ZtDcBn4gaNRxnZIMwftilKgRX-PgCyJMiZDRtr3mspE?purpose=fullsize\"<\/div>\n<\/div>\n<\/div>\n
                \n
                \n
                \"https:\/\/images.openai.com\/static-rsc-4\/8nTaK7gd9xWrj1eHI781z5HAI8RydzEYoP4N0q4ftxfWEsbdujQ-mZJUtvJ3qwxTaBAVIrxWe0zNuY7_TJox1m3mc7TlGDYXDYYoCq7MN4dXsTu-O6oIxs74SwsLfK1yLKQn4u4BzZeFUBFRhoAo0mayKScsY6EPiTTx8iMXWS9E2TObNjw2tiRZbT2zOEZK?purpose=fullsize\"<\/div>\n<\/div>\n<\/div>\n
                \n
                \n
                \"https:\/\/images.openai.com\/static-rsc-4\/VAPms_t1ITiV_VOZi6rYK5I14QbpyZEI4LZadsZDIQGs2qWrswPJ3YEaXTRUlOWg4S6zk6hVPaIXFfy4UfV35PQZ4vk271p0-q-2WsdLo1e6RV1ltsxgu_TNBYzOKCG2fctu_hUtJ6_DPrO4DH-_wJ_8nYDOHO6glP7xG_MVQQdrU4vLzWq-atYNv-KjrdYA?purpose=fullsize\"<\/div>\n
                \n
                \n
                5<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
                \n

                Power Generation Plants<\/h2>\n

                Used in:<\/p>\n

                  \n
                • Steam pipelines<\/li>\n
                • Boiler auxiliary systems<\/li>\n
                • Feedwater systems<\/li>\n
                • Heat transfer systems<\/li>\n<\/ul>\n

                  Power Plant Application<\/h3>\n
                  \n
                  \n
                  \n
                  \"https:\/\/images.openai.com\/static-rsc-4\/aKQUxGWtK8sJqTLsJChzeNPlF9mtM7U-vETIdMr93XBM6DoeIj99leczZI0aywJ-gMTql1INmBXpV1TeLuV46tIwiSsLipZ9JU_TjY40nMMdEEsuUD_O_PqtCMeWW7kJGCr1Feak6ddVgfL3YM9DhzufFaMBNvCNgPvLDqQA6vbpj5kbyPs6tD4oU_8kzSsL?purpose=fullsize\"<\/div>\n<\/div>\n<\/div>\n
                  \n
                  \n
                  \"https:\/\/images.openai.com\/static-rsc-4\/qaeNikVARMfPt0VhuuAVLnlJJ7MZyQHbLJDn9CNrjvcncIJ9zTyqWTHUnAb1pbxmMzU2SQrD4L28-3XzPInbp-w1k07FU2BCwTdx73m7xV1aDLauhc7pw3RCvQEQ54Cgb-KPU288N1JmZg6xc5YNzSuBIleARV-UVI0IOmbhF0MahOeIvv5FU2ZTmLfQ3u6v?purpose=fullsize\"<\/div>\n<\/div>\n<\/div>\n
                  \n
                  \n
                  \"https:\/\/images.openai.com\/static-rsc-4\/pUAw19Jn2jnnSr8RTrG1Ii2bnHyTASJ9_K33KtdzF1slxXeY6K3k_9gG3a1b1SozTri2Jc6jDICh-ThafR5hpRuM2N5bPyS9709BOfQ7h-Jpjfn66whdBC2e457AVWZvmM1TOIuPpe1qKwokjthwnDhXn8BaZ9UAC7Hr3kO73tuRW1H_hfEMken3xZh9gquc?purpose=fullsize\"<\/div>\n
                  \n
                  \n
                  5<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
                  \n

                  Petrochemical Facilities<\/h2>\n

                  Applied in:<\/p>\n

                    \n
                  • Process piping<\/li>\n
                  • Thermal oil systems<\/li>\n
                  • Utility steam lines<\/li>\n
                  • Heat exchanger circuits<\/li>\n<\/ul>\n
                    \n

                    Industrial Heating Systems<\/h2>\n

                    Ideal for:<\/p>\n

                      \n
                    • Thermal oil plants<\/li>\n
                    • Process heaters<\/li>\n
                    • Furnace systems<\/li>\n
                    • Heat recovery units<\/li>\n<\/ul>\n
                      \n

                      Advantages of F20 Forged Steel Check Valves<\/h1>\n
                      \n
                      \n\n\n\n\n\n\n\n\n\n\n
                      Feature<\/th>\nBenefit<\/th>\n<\/tr>\n<\/thead>\n
                      F20 Alloy Steel<\/td>\nHigh-temperature resistance<\/td>\n<\/tr>\n
                      API 602 Design<\/td>\nCompact and reliable<\/td>\n<\/tr>\n
                      Forged Construction<\/td>\nHigh strength<\/td>\n<\/tr>\n
                      Swing Disc Design<\/td>\nLow pressure drop<\/td>\n<\/tr>\n
                      RF Flanged Ends<\/td>\nEasy installation<\/td>\n<\/tr>\n
                      Automatic Operation<\/td>\nNo external power needed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
                      \n

                      F20 vs A105 Check Valve<\/h1>\n
                      \n
                      \n\n\n\n\n\n\n\n\n\n
                      Property<\/th>\nASTM A182 F20<\/th>\nASTM A105<\/th>\n<\/tr>\n<\/thead>\n
                      High-Temperature Strength<\/td>\nExcellent<\/td>\nModerate<\/td>\n<\/tr>\n
                      Oxidation Resistance<\/td>\nSuperior<\/td>\nStandard<\/td>\n<\/tr>\n
                      Creep Resistance<\/td>\nExcellent<\/td>\nLimited<\/td>\n<\/tr>\n
                      Service Temperature<\/td>\nHigher<\/td>\nLower<\/td>\n<\/tr>\n
                      Cost<\/td>\nHigher<\/td>\nLower<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

                      For elevated-temperature applications, F20 alloy steel is generally preferred over carbon steel.<\/p>\n

                      \n

                      Quality Assurance<\/h1>\n

                      Each valve undergoes comprehensive testing:<\/p>\n

                      Hydrostatic Shell Test<\/h3>\n

                      Verifies body pressure integrity.<\/p>\n

                      Seat Leakage Test<\/h3>\n

                      Ensures reliable sealing performance.<\/p>\n

                      PMI Material Identification<\/h3>\n

                      Confirms F20 alloy composition.<\/p>\n

                      Dimensional Inspection<\/h3>\n

                      Ensures compliance with API 602 requirements.<\/p>\n

                      Optional NDE<\/h3>\n
                        \n
                      • Ultrasonic Testing (UT)<\/li>\n
                      • Magnetic Particle Testing (MT)<\/li>\n
                      • Dye Penetrant Testing (PT)<\/li>\n
                      • Radiographic Testing (RT)<\/li>\n<\/ul>\n
                        \n

                        Optional Features<\/h1>\n

                        Seat Options<\/h3>\n
                          \n
                        • Integral Seat<\/li>\n
                        • Stellite Hardfaced Seat<\/li>\n<\/ul>\n

                          Compliance Options<\/h3>\n
                            \n
                          • NACE MR0175<\/li>\n
                          • API 6D Requirements<\/li>\n
                          • Fire Safe Design<\/li>\n
                          • Low Emission Packing<\/li>\n<\/ul>\n

                            Certification<\/h3>\n
                              \n
                            • EN 10204 3.1<\/li>\n
                            • Third-Party Inspection (SGS, BV, TUV, DNV)<\/li>\n<\/ul>\n
                              \n

                              Frequently Asked Questions<\/h1>\n

                              What is ASTM A182 F20?<\/h3>\n

                              F20 is a chromium-molybdenum alloy steel designed for high-temperature service with excellent creep resistance and oxidation resistance.<\/p>\n

                              Why choose API 602 forged valves?<\/h3>\n

                              API 602 valves provide superior strength and reliability compared with cast valves, especially for small-bore, high-integrity applications.<\/p>\n

                              Is Class 150 suitable for steam systems?<\/h3>\n

                              Yes. Class 150 valves are widely used in medium-pressure steam and thermal oil systems.<\/p>\n

                              What is the advantage of a flanged connection?<\/h3>\n

                              RF flanges provide easier installation and maintenance compared with welded connections.<\/p>\n

                              Which industries use F20 check valves?<\/h3>\n

                              Power plants, oil refineries, petrochemical facilities, thermal oil systems, and industrial process plants.<\/p>\n

                              \n

                              Request a Quote<\/h1>\n

                              China API 602 Forged Steel Check Valve Manufacturer<\/h2>\n

                              We provide:<\/p>\n

                              \u2705 API 602 Forged Valve Manufacturing
                              \u2705 ASTM A182 F20 Alloy Steel Expertise
                              \u2705 High-Temperature Valve Solutions
                              \u2705 Third-Party Inspection Support
                              \u2705 OEM & Custom Engineering Services
                              \u2705 Worldwide Export Experience<\/p>\n

                              Please provide:<\/p>\n

                                \n
                              • Valve Size (1 Inch)<\/li>\n
                              • Pressure Rating (Class 150)<\/li>\n
                              • End Connection (RF Flanged)<\/li>\n
                              • Operating Temperature<\/li>\n
                              • Media Type<\/li>\n
                              • Quantity Required<\/li>\n<\/ul>\n

                                Our engineering team will provide a detailed quotation, GA drawing, material certificates, and delivery schedule within 24 hours.<\/p>\n

                                <\/h2>\n","protected":false},"excerpt":{"rendered":"

                                STV Valve Technology Group Co., Ltd is a professional leader China F20 API 602 Check Valve, ASTM A182 F20 Check Valve, 1 Inch Check Valve, Class 150 Check Valve, Flanged Check Valve, Forged Steel Check Valve, High Temperature Check Valve, Alloy Steel Check Valve, API 602 Swing Check Valve, Industrial Check Valve Manufacturer, China Check Valve Manufacturer with high quality and competitive price.<\/p>\n

                                \u064a\u0631\u062c\u0649 \u0627\u0644\u0627\u062a\u0635\u0627\u0644 \u0628\u0646\u0627 \u0639\u0644\u0649 sales@stvvalve.com \u0644\u0644\u062d\u0635\u0648\u0644 \u0639\u0644\u0649 \u0645\u0648\u0627\u062f \u0648\u062a\u0641\u0627\u0635\u064a\u0644 \u0623\u062e\u0631\u0649.<\/p>\n

                                <\/h1>","protected":false},"featured_media":8941,"template":"","meta":[],"product_brand":[],"product_cat":[46,66],"product_tag":[4165,4168,2304,4164,4169,4163,4166,1029,303,4167,4144],"class_list":["post-8848","product","type-product","status-publish","has-post-thumbnail","product_cat-check-valves","product_cat-swing-check-valve","product_tag-1-inch-check-valve","product_tag-alloy-steel-check-valve","product_tag-api-602-swing-check-valve","product_tag-astm-a182-f20-check-valve","product_tag-china-check-valve-manufacturer","product_tag-china-f20-api-602-check-valve","product_tag-class-150-check-valve","product_tag-flanged-check-valve","product_tag-forged-steel-check-valve","product_tag-high-temperature-check-valve","product_tag-industrial-check-valve-manufacturer","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/www.stvvalves.com\/ar\/wp-json\/wp\/v2\/product\/8848","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.stvvalves.com\/ar\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.stvvalves.com\/ar\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.stvvalves.com\/ar\/wp-json\/wp\/v2\/media\/8941"}],"wp:attachment":[{"href":"https:\/\/www.stvvalves.com\/ar\/wp-json\/wp\/v2\/media?parent=8848"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.stvvalves.com\/ar\/wp-json\/wp\/v2\/product_brand?post=8848"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.stvvalves.com\/ar\/wp-json\/wp\/v2\/product_cat?post=8848"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.stvvalves.com\/ar\/wp-json\/wp\/v2\/product_tag?post=8848"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}