{"id":8922,"date":"2026-06-14T09:09:36","date_gmt":"2026-06-14T01:09:36","guid":{"rendered":"https:\/\/www.stvvalves.com\/?post_type=product&p=8922"},"modified":"2026-06-14T09:39:47","modified_gmt":"2026-06-14T01:39:47","slug":"bolt-bonnet-gate-valve-astm-a217-wc6-14-inch-900-lb-bw-end","status":"publish","type":"product","link":"https:\/\/www.stvvalves.com\/es\/products\/bolt-bonnet-gate-valve-astm-a217-wc6-14-inch-900-lb-bw-end\/","title":{"rendered":"Bolt Bonnet Gate Valve , ASTM A216 WC7, 14 Inch, 900 LB ,BW End"},"content":{"rendered":"

High-Pressure Alloy Steel Gate Valve for Power Generation, Steam, and High-Temperature Service<\/h2>\n

The Bolt Bonnet Gate Valve<\/a>, ASTM A217 WC6, 14 Inch, Class 900 LB, Butt Weld (BW) End<\/strong> is a heavy-duty isolation valve specifically engineered for high-pressure and high-temperature applications. Manufactured from ASTM A217 WC6 chrome-moly alloy steel<\/strong>, this valve offers exceptional strength, creep resistance, and long-term reliability in demanding services such as power generation, refinery processing, petrochemical plants, and high-temperature steam systems.<\/p>\n

Designed in accordance with API 600<\/strong>, ASME B16.34<\/strong>, and ASME B16.25<\/strong>, the valve<\/a> provides reliable bidirectional shutoff, low pressure drop, and excellent structural integrity under severe operating conditions.<\/p>\n

\n

Product Overview<\/h2>\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 Type<\/td>\nBolt Bonnet Gate Valve<\/td>\n<\/tr>\n
Valve Size<\/td>\n14 Inch (DN350)<\/td>\n<\/tr>\n
Pressure Rating<\/td>\nASME Class 900 LB<\/td>\n<\/tr>\n
Body Material<\/td>\nASTM A217 WC6<\/td>\n<\/tr>\n
Bonnet Type<\/td>\nBolted Bonnet<\/td>\n<\/tr>\n
Disc Type<\/td>\nFlexible Wedge<\/td>\n<\/tr>\n
End Connection<\/td>\nButt Weld (BW)<\/td>\n<\/tr>\n
Design Standard<\/td>\nAPI 600<\/td>\n<\/tr>\n
Face-to-Face<\/td>\nASME B16.10<\/td>\n<\/tr>\n
Butt Weld Ends<\/td>\nASME B16.25<\/td>\n<\/tr>\n
Testing Standard<\/td>\nAPI 598<\/td>\n<\/tr>\n
Pressure-Temperature<\/td>\nASME B16.34<\/td>\n<\/tr>\n
Operation<\/td>\nHandwheel, Gear, Electric Actuator<\/td>\n<\/tr>\n
Applicable Media<\/td>\nSteam, Hot Oil, High-Temperature Fluids<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
\n

Product Features<\/h1>\n

ASTM A217 WC6 Alloy Steel Construction<\/h3>\n

WC6 is a chromium-molybdenum alloy steel widely used in elevated-temperature service.<\/p>\n

Benefits include:<\/p>\n

    \n
  • Excellent creep resistance<\/li>\n
  • Superior thermal stability<\/li>\n
  • High-pressure capability<\/li>\n
  • Enhanced oxidation resistance<\/li>\n
  • Long service life in steam applications<\/li>\n<\/ul>\n
    \n

    Class 900 Pressure Rating<\/h3>\n

    Designed for severe operating conditions:<\/p>\n

      \n
    • High-pressure steam systems<\/li>\n
    • Power station pipelines<\/li>\n
    • Refinery process lines<\/li>\n
    • High-temperature utility systems<\/li>\n<\/ul>\n

      The Class 900 rating provides outstanding strength and pressure containment.<\/p>\n

      \n

      Flexible Wedge Gate Design<\/h3>\n

      The flexible wedge ensures:<\/p>\n

        \n
      • Tight shutoff performance<\/li>\n
      • Improved seat contact<\/li>\n
      • Compensation for thermal expansion<\/li>\n
      • Reduced operating torque<\/li>\n
      • Enhanced sealing reliability<\/li>\n<\/ul>\n
        \n

        Butt Weld End Connection<\/h3>\n

        BW ends provide:<\/p>\n

          \n
        • Permanent leak-free joints<\/li>\n
        • High structural integrity<\/li>\n
        • Reduced maintenance requirements<\/li>\n
        • Excellent performance under thermal cycling<\/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 A217 WC6<\/td>\n<\/tr>\n
          Bonnet<\/td>\nASTM A217 WC6<\/td>\n<\/tr>\n
          Wedge<\/td>\nASTM A217 WC6 + Stellite<\/td>\n<\/tr>\n
          Seat Ring<\/td>\n13Cr \/ Stellite Overlay<\/td>\n<\/tr>\n
          Stem<\/td>\nASTM A182 F6a<\/td>\n<\/tr>\n
          Gasket<\/td>\nSpiral Wound SS\/Graphite<\/td>\n<\/tr>\n
          Packing<\/td>\nFlexible Graphite<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
          \n

          Design 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 600<\/td>\nSteel Gate Valve Design<\/td>\n<\/tr>\n
          ASME B16.34<\/td>\nValve Design Requirements<\/td>\n<\/tr>\n
          ASME B16.10<\/td>\nFace-to-Face Dimensions<\/td>\n<\/tr>\n
          ASME B16.25<\/td>\nButt Weld Ends<\/td>\n<\/tr>\n
          API 598<\/td>\nInspection & Testing<\/td>\n<\/tr>\n
          MSS SP-61<\/td>\nPressure Testing<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
          \n

          Working Principle<\/h1>\n

          The gate valve operates through a linear-motion mechanism.<\/p>\n

          Opening<\/h3>\n
            \n
          1. Handwheel rotates stem.<\/li>\n
          2. Wedge rises vertically.<\/li>\n
          3. Flow path becomes fully open.<\/li>\n
          4. Minimal pressure drop occurs.<\/li>\n<\/ol>\n

            Closing<\/h3>\n
              \n
            1. Stem lowers wedge.<\/li>\n
            2. Wedge contacts seat rings.<\/li>\n
            3. Tight shutoff is achieved.<\/li>\n
            4. Flow is completely isolated.<\/li>\n<\/ol>\n

              Because the gate is fully removed from the flow path when open, pressure losses are extremely low.<\/p>\n

              \n

              Typical Applications<\/h1>\n

              Thermal Power Plants<\/h2>\n

              WC6 gate valves are extensively used in:<\/p>\n

                \n
              • Main steam lines<\/li>\n
              • Reheat steam systems<\/li>\n
              • Boiler outlet piping<\/li>\n
              • Turbine inlet systems<\/li>\n<\/ul>\n

                Application Example<\/h3>\n
                \n
                \n
                \n
                \"https:\/\/images.openai.com\/static-rsc-4\/UQMvUFvXpBdQnWcnW1h_fNFhKK3At_HFoxEtM9LwlRB-qsEZAfPdGCypDGhX0l0SuHVduOPJDiO1-fDG3Tpn3tmzExgpj9bFVqYBoxvEiqvd8TLgBB6vWwViXIqPHgqgIwJZsSZOUn06O9V5OpasbsgPwPYDF6Qqoj_rJiTrU6WNLRb6tTZ2NuJMFHbKh8xA?purpose=fullsize\"<\/div>\n<\/div>\n<\/div>\n
                \n
                \n
                \"https:\/\/images.openai.com\/static-rsc-4\/EW7fbh3Kk45zXAZwP51MHP24wrHYUtV_HCHTIi1-jyD-Ed2vQsRu2NzqyjO6Rfr1bVg-P4u3_SbK_B00FaXWGWL5mxofnwLP2E6I4YlZPn1unMtrJLGexdLkxegxR03m7cL7j2GMqNTbp7fls9cmr0ePdQsR0vA85RHsu--Uw3WfwwEmCdNS1gAQNc2cpmB9?purpose=fullsize\"<\/div>\n<\/div>\n<\/div>\n
                \n
                \n
                \"https:\/\/images.openai.com\/static-rsc-4\/L4qgUQYdsEXidJGAoi8UWUA1IACDl5qd1NTagKctDoA1gXNgOsNnKWzVMMVWdCEyI0suVJT9sBRC_JH_FVHw8QqZxRfY2ylfjLPj1rIkx5JUkLcempPrVFR6zRF0ib9wNj0iAbPQApk7_ojnXACQVmiKZSdcmsjfgOlCGUG72_TMQB0N8RGESMNtLFVFI4YS?purpose=fullsize\"<\/div>\n
                \n
                \n
                5<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
                \n

                Petrochemical Industry<\/h2>\n

                Suitable for:<\/p>\n

                  \n
                • High-temperature process lines<\/li>\n
                • Hydrocarbon processing<\/li>\n
                • Utility steam networks<\/li>\n
                • Cracking units<\/li>\n<\/ul>\n

                  Application Example<\/h3>\n
                  \n
                  \n
                  \n
                  \"https:\/\/images.openai.com\/static-rsc-4\/w8lHXXJQIhfSzIvEsbtvyOEw2s_xwLhIyZtV2MyVIyxbjpluGk7b0LXKlDMHKYTMNODfzJEkJhRiApK1L3MeJYuSyGdUIYJK0inz83I-Wlhe8u-bUGTApdUVT5q64G3h9dQqSmPCvSa4jo7ANNmTjScKXmEoEYE64HendplUqGbJhSBtLlJM1q2uy1HLaaKE?purpose=fullsize\"<\/div>\n<\/div>\n<\/div>\n
                  \n
                  \n
                  \"https:\/\/images.openai.com\/static-rsc-4\/SqqI_-s8POhUF5-L2AAaf4-fIcUejYG40SG9M-Rmzev_7pev3XJvIy1VDVkhH3iU2xtZ2eBe9i16Qksxq5KlerjzDWfGwNJ7mn8BWkOZn4ZCbZqTQX6xrf2pGmne6NCQG30i5RK5Do07Xu0V1ztWJ5oL6CXM3K-pgAhSehM8sWhTdqa7W0mlDOi14d-yFiBr?purpose=fullsize\"<\/div>\n<\/div>\n<\/div>\n
                  \n
                  \n
                  \"https:\/\/images.openai.com\/static-rsc-4\/BVwoWxpFIiMZihlUxOBfGaN40jUNa__BOczgTCVwgjQslqqgqsVVA-kXNegFwZHn6lHm5C6ar-ASm8O-HyK53_o3qH-akBh1wTPYjtlf-IfOKGuH6ACu4mq6RLAG2x3-kJCLSEAyanCm7rPa-alMFbblvcuB7L9mGKV6WCRqLrvAdpjFtg9z27fTPrIdAcHx?purpose=fullsize\"<\/div>\n
                  \n
                  \n
                  6<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
                  \n

                  Oil Refining Facilities<\/h2>\n

                  Used in:<\/p>\n

                    \n
                  • Process isolation<\/li>\n
                  • Steam tracing systems<\/li>\n
                  • High-pressure utility services<\/li>\n
                  • Heat recovery systems<\/li>\n<\/ul>\n
                    \n

                    Industrial Steam Systems<\/h2>\n

                    Ideal for:<\/p>\n

                      \n
                    • Superheated steam<\/li>\n
                    • High-pressure steam distribution<\/li>\n
                    • Heat transfer systems<\/li>\n
                    • Industrial boilers<\/li>\n<\/ul>\n
                      \n

                      Installation Guide<\/h1>\n

                      Proper installation is essential for maximizing valve performance and service life.<\/p>\n

                      Recommended Installation Practices<\/h2>\n

                      Pipeline Preparation<\/h3>\n
                        \n
                      • Clean piping thoroughly before installation.<\/li>\n
                      • Remove welding slag and debris.<\/li>\n
                      • Verify alignment of piping ends.<\/li>\n<\/ul>\n

                        Welding Requirements<\/h3>\n
                          \n
                        • Follow qualified welding procedures.<\/li>\n
                        • Apply appropriate preheating and PWHT when required.<\/li>\n
                        • Protect internal sealing surfaces during welding.<\/li>\n<\/ul>\n

                          Flow Direction<\/h3>\n
                            \n
                          • Install according to manufacturer recommendations.<\/li>\n
                          • Generally suitable for bidirectional service.<\/li>\n<\/ul>\n

                            Stem Position<\/h3>\n
                              \n
                            • Preferred installation is vertical stem upward.<\/li>\n
                            • Horizontal installation may be acceptable based on application requirements.<\/li>\n<\/ul>\n

                              Installation Example<\/h3>\n
                              \n
                              \n
                              \n
                              \"https:\/\/images.openai.com\/static-rsc-4\/HHv4Pg7M34doPndolQjYOCzhEIfaI7yzXLVDPwknAjPKYgxdIiKFjjCbys_NrGHlwJNTpP7DmxOHTaA11-A3l1_dabtNkzlDLHGgxvf-eHh5un9w_xFvUQSUMr78KpQLkt520FCRXwZ7j7Ds5bhsLGlzSm62Uw752yTBCZZ3pj6NfJgqahVP4JlKVA5ZQza9?purpose=fullsize\"<\/div>\n<\/div>\n<\/div>\n
                              \n
                              \n
                              \"https:\/\/images.openai.com\/static-rsc-4\/nXVQmo9vKqUFyA9paR3IPPwMucnY711cWSaXkp-nP5w5aqdQg6pQJ4c29fYiwxdXEkzyw4-JxUEnIRKKaNl4A-zKQDMrH6mbHI-_Hwa1molvfXrS68OFuGdtRnlHTa5fSp1lnWcq4l3uWwA94jABwApIBil-W9iqmgjJKtbMiLjpC9G1Z2nTahdk2kIafKCe?purpose=fullsize\"<\/div>\n<\/div>\n<\/div>\n
                              \n
                              \n
                              \"https:\/\/images.openai.com\/static-rsc-4\/3Pyl6U4UC8LsIv0tJjc3TyL6-_QlWcqotLKTa-8R-MGm7tMheXm-mVCXOFOHP6KFwguBhhKiFcSI9OWFEJq9pOmCgcrgEBJJnEMNRJdo174C8G52g_eiI0Czjjq8nHFVku_1AmFJbfW-hAQ9cCUre4kOQOcCAOvRO7t-TearCBfHIjF9gwdfqQGj82p6IiaR?purpose=fullsize\"<\/div>\n<\/div>\n<\/div>\n<\/div>\n
                              \n

                              Advantages of WC6 Gate Valves<\/h1>\n
                              \n
                              \n\n\n\n\n\n\n\n\n\n\n
                              Feature<\/th>\nBenefit<\/th>\n<\/tr>\n<\/thead>\n
                              Alloy Steel Construction<\/td>\nHigh-temperature strength<\/td>\n<\/tr>\n
                              Class 900 Rating<\/td>\nHigh-pressure performance<\/td>\n<\/tr>\n
                              Flexible Wedge Design<\/td>\nImproved sealing reliability<\/td>\n<\/tr>\n
                              Butt Weld Ends<\/td>\nLeak-free installation<\/td>\n<\/tr>\n
                              Full Port Design<\/td>\nMinimal pressure drop<\/td>\n<\/tr>\n
                              Stellite Seating<\/td>\nEnhanced wear resistance<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
                              \n

                              WC6 Gate Valve vs WCB Gate Valve<\/h1>\n
                              \n
                              \n\n\n\n\n\n\n\n\n\n\n
                              Feature<\/th>\nWC6<\/th>\nWCB<\/th>\n<\/tr>\n<\/thead>\n
                              Temperature Capability<\/td>\nHigher<\/td>\n<\/td>\n<\/tr>\n
                              Creep Resistance<\/td>\nExcellent<\/td>\n<\/td>\n<\/tr>\n
                              Steam Service<\/td>\nExcellent<\/td>\n<\/td>\n<\/tr>\n
                              Thermal Fatigue Resistance<\/td>\nSuperior<\/td>\n<\/td>\n<\/tr>\n
                              Material Cost<\/td>\nHigher<\/td>\n<\/td>\n<\/tr>\n
                              Typical Application<\/td>\nPower Plants<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

                              For temperatures above approximately 425\u00b0C, WC6 is generally preferred over WCB.<\/p>\n

                              \n

                              Inspection and Testing<\/h1>\n

                              Each valve undergoes:<\/p>\n

                              Hydrostatic Shell Test<\/h3>\n

                              Verifies pressure integrity.<\/p>\n

                              High-Pressure Seat Test<\/h3>\n

                              Ensures sealing performance.<\/p>\n

                              PMI Testing<\/h3>\n

                              Confirms alloy composition.<\/p>\n

                              Dimensional Inspection<\/h3>\n

                              Ensures compliance with standards.<\/p>\n

                              NDE Examination<\/h3>\n

                              Optional:<\/p>\n

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

                                Frequently Asked Questions<\/h1>\n

                                Why is WC6 used for steam applications?<\/h3>\n

                                WC6 contains chromium and molybdenum, providing excellent strength and creep resistance at elevated temperatures.<\/p>\n

                                What is the advantage of a butt weld end?<\/h3>\n

                                BW connections eliminate flange leakage risks and provide stronger, permanent pipeline joints.<\/p>\n

                                Can this valve be automated?<\/h3>\n

                                Yes. Electric, pneumatic, and hydraulic actuators can be supplied.<\/p>\n

                                Is the valve suitable for superheated steam?<\/h3>\n

                                Yes. WC6 gate valves are commonly used in superheated steam systems within design limits.<\/p>\n

                                What industries commonly use Class 900 WC6 gate valves?<\/h3>\n

                                Power generation, petrochemical processing, refineries, fertilizer plants, and industrial steam facilities.<\/p>\n

                                \n

                                Request a Quote<\/h1>\n

                                China WC6 Class 900 Gate Valve Manufacturer<\/h2>\n

                                We provide:<\/p>\n

                                \u2705 API 600 Certified Manufacturing
                                \u2705 Alloy Steel Valve Expertise
                                \u2705 NACE MR0175 Available
                                \u2705 Third-Party Inspection Support
                                \u2705 Fast Production Lead Times
                                \u2705 Worldwide Export Experience<\/p>\n

                                Please provide:<\/p>\n

                                  \n
                                • Valve Size (14 Inch \/ DN350)<\/li>\n
                                • Pressure Rating (Class 900)<\/li>\n
                                • Operating Temperature<\/li>\n
                                • Media Type<\/li>\n
                                • Quantity Required<\/li>\n
                                • Special Testing Requirements<\/li>\n<\/ul>\n

                                  Our engineering team will provide a detailed quotation, technical datasheet, GA drawing, and delivery schedule within 24 hours.<\/p>\n","protected":false},"excerpt":{"rendered":"

                                  STV Valve Technology Group Co., Ltd is China Bolt Bonnet Gate Valve, ASTM A217 WC6 Gate Valve, Class 900 Gate Valve, 14 Inch Gate Valve, BW End Gate Valve, High Pressure Gate Valve, Steam Service Gate Valve, Alloy Steel Gate Valve, API 600 Gate Valve, Power Plant Gate Valve, Industrial Gate Valve Manufacturer, China Gate Valve Supplier. with high quality and low price.<\/p>\n

                                   <\/p>\n

                                   <\/p>","protected":false},"featured_media":8923,"template":"","meta":[],"product_brand":[],"product_cat":[44,58],"product_tag":[4121,4123,1603,3814,196,2247,4125,4097,195,4124,4099,4122],"class_list":{"0":"post-8922","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-gate-valve","7":"product_cat-cast-steel-gate-valve","8":"product_tag-14-inch-gate-valve","9":"product_tag-alloy-steel-gate-valve","10":"product_tag-api-600-gate-valve","11":"product_tag-astm-a217-wc6-gate-valve","12":"product_tag-bolt-bonnet-gate-valve","13":"product_tag-bw-end-gate-valve","14":"product_tag-china-gate-valve-supplier","15":"product_tag-class-900-gate-valve","16":"product_tag-high-pressure-gate-valve","17":"product_tag-industrial-gate-valve-manufacturer","18":"product_tag-power-plant-gate-valve","19":"product_tag-steam-service-gate-valve","21":"first","22":"instock","23":"shipping-taxable","24":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/www.stvvalves.com\/es\/wp-json\/wp\/v2\/product\/8922","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.stvvalves.com\/es\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.stvvalves.com\/es\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.stvvalves.com\/es\/wp-json\/wp\/v2\/media\/8923"}],"wp:attachment":[{"href":"https:\/\/www.stvvalves.com\/es\/wp-json\/wp\/v2\/media?parent=8922"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.stvvalves.com\/es\/wp-json\/wp\/v2\/product_brand?post=8922"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.stvvalves.com\/es\/wp-json\/wp\/v2\/product_cat?post=8922"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.stvvalves.com\/es\/wp-json\/wp\/v2\/product_tag?post=8922"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}