Characteristic: The double-decked corrugated pipe, the service is convenient, the dual seal, the position instructionApplication situation: The power plant, the natural gas, the ammonia, the freezing are systematic, the hot oil system, the hot waterThe valve uses the standard: Valve design manufacture standard: DIN3356-82;

Structural length standard: DIN3202;
Flange standard: DIN2543-DIN2546;
Valve experiment examination standard: DIN3230-75