公司主要產品為公稱通徑Φ6-500mm、公稱壓力0.1MPa～40 MPa的各類截止閥、截止止回閥、止回閥、閘閥、旋塞、球閥、安全閥、減壓閥、蝶閥、消防閥等，材質包括鑄鐵、鑄鋼、鑄銅、鍛鋼、鍛銅、不銹鋼、鋁合金、鈦合金等。閥門標準有國家標準（GB）、部標準（CB）、日本標準（JIS）及非標閥門，如客戶有特殊要求，可按照客戶提供的圖紙、實物進行設計、制造。
        公司1986年引進德國Pleiger公司液壓閥門遙控系統技術，經過消化吸收和自主開發，研制了液動閥門遙控系統、電液動閥門遙控系統、氣動閥門遙控系統、電動閥門遙控系統。并先后獲得CCS、LR、ABS、DNV及GL等船級社認可。
        公司擁有ISO9000質量管理體系、ISO14001環境管理體系、GB/T28001職業健康安全管理體系等相關資格認證，并創建了“凌久”著名商標。
        公司秉承“質量第一、用戶至上”的宗旨，愿以優質的產品、熱忱的服務與各界人士真誠合作！

        Our main products are all kinds of stop valves, stop check valves, check valves, gate valves, cocks, ball valves, safety valves, pressure reducing valves, butterfly valves, fire fighting valves in nominal diameter Φ6-500mm or nominal pressure 0.1MPa to 40 MPa etc…,and materials of valves including cast steel, cast iron, bronze, forged steel, wrought copper, stainless steel, aluminum alloy, titanium alloy etc…, based on GB, CB, JIS standards and other non-standards. We may design and manufacture as per drawings, real objects and other relevant information provided by the customer if customer requires so .
        The company introduced in 1986 from Germany Pleiger company the hydraulic valve remote control systems technology, after our studying ,absorbing and self-developing, developed hydraulic valve remote control systems, electric hydraulic valve remote control systems, pneumatic valve remote control systems, electric valve remote control systems by ourselves .and successively been ratified by CCS, LR, ABS, DNV and GL etc classification societies.
        The company has obtained ISO9000 quality management system certificate, ISO14001 environmental management system certificate, GB/T28001 Occupational Health and Safety Management System certificate,also holds a famous teademark “lingjiu”.
        Obedience to the principle of "quality first, customers supreme", we wish to cooperate with friends of all circles based on our outstanding product quality and warmly service!