ZECO cast steel gate valve is in controlled under the quality assurance system of production and manufacturing, has met all the international industry standards and user requirements documented procedures. These procedures and control including raw materials purchasing and validation, process control, assembly, testing and shipment, and all the necessary documents. ZECO quality guarantee system has been formed in ISO and API approved manual file. ZECO is ISO 9001 certified and licensed to the API to monogram API 6D product. Each valve is designed to verify compliance by functional and pressure testing. This results in a material test report documenting the chemical and mechanical properties for the pressure additional non-destructive examinations are also recorded and referenced to the valve serial number.
1. The rising stem of ZECO cast steel gate valve can be designed with precision ACME double thread， This design allows you to open or close almost twice as fast and reduces manual operation;
2. The stem packing of ZECO cast steel gate valve is designed to optimally control media leakage from the stem. ZECO adopts CNC machine tools to process the valve stem sealing area, with good smoothness. The straightness of the valve stem is measured by special angle measuring instrument, ensuring the best sealing effect of the valve stem packing;
3. The backseat design of ZECO cast steel gate valve can reduce the trouble of removing the valve from the pipeline when the valve needs maintenance during service;
4. According to the working conditions, stellited can be used as the material of the valve wedge sealing surface and valve seat ring sealing surface of ZECO cast steel gate valve to enhance the abrasion resistance and corrosion resistance of the sealing ring.
ASTM A216 WCB
ASTM A105 + STL
ASTM A216 WCB + STL
ASTM A276 410
Graphite + SS304
ASTM A193 B7
ASTM A194 2H
ASTM A216 WCB
ASTM A182 F6a