I-COVNA, umkhiqizi wamavalvu onolwazi lweminyaka engu-20 osebenza ngokukhethekile kumavalvu anenjini, amavalvu e-pneumatic actuator, ama-solenoid valve, amaglobhu amavalvu, amavalvu esango, njll. Kuqinisekiswe yi-ISO9001:2008.UMay umake inguquko enkulu ku-COVNA.Sathuthela efekthri entsha, enkulu, evulekile, ngaphezulu...
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