The unidirectional wafer‐design knife gate valves of the A series are made of a one‐piece cast body with guides to support the gate and the seat wedges.
The unidirectional wafer‐design knife gate valves of the A series provide high flow rates with low pressure drop. Various seat and packing materials are available. An arrow is marked on the body indicating the flow direction.
The unidirectional wafer‐design knife gate valve of the A series is suitable for liquids that contain a maximum of 5% suspended solids. If it is used for dry solids in gravity feed applications it should be installed with the arrow on the body pointing in the opposite direction to the flow.
Sizes: ND50 to ND2000 (larger sizes are available on request).
‐ND50 to ND150: 10kg/cm²
‐ND250 to ND300: 6kg/cm²
‐ND350 to ND400: 5kg/cm²
‐ND450 to ND600: 3kg/cm²
‐ND700 to ND1400: 2kg/cm²
The mentioned working pressures are just valid for the pressures applied on the direction of the arrow market on the body. As the valve is designed with gate support guides, the valves are able to support a 30% of these pressures from the opposite direction without any damage on them. In these cases, the valves are not 100% water tight. To obtain total water tightness in these conditions, it is necessary to incorporate additional supports.