Large size soft seated butterfly valves

Conforming to American Water Works Association Standard, these valves are the best choice as isolation valves for water and gas applications. Ensuring bubble tight closure, due to soft seating, these are available in wide range of size from80mm to 2600 mm and materials to suit any process requirements. These valves can be actuated manually, electrically or pneumatically with facilities for remote operation. Optionally fitted with automatic trip mechanism, they function as emergency shut-off valves.

The low noise cage type control valves are featured with very low operating noise (aerodynamic noise) when they are used to handle compressive fluids, such as steam, air fuel, gas, ethylene gas, etc. The cage and valve plug are of multiple hole construction. The components " restriction", "divergence", "expansion" are laid out in a rational manner to accomplish low noise pressure reducing action. Valve plug is designed to produce no torque vibration. Valve plug is held directly inside the cage to resist vibration and wear. The modular concept in design and construction allows component interchangeability with those of the VDC cage valves. Thus, valves can be disassembled and reassembled resulting in quick maintenance, and minimising down time.

Bellows sealed valves

Escape of radioactive or toxic fluids to atmosphere is highly hazardous to the environment. These valves are specially designed to prevent such escape by provision of bellows seal with backup gland and leak off connection. To ensure high reliability in any adverse working conditions these valves undergo very stringent quality checks complete with well documented reports right from the raw material stage-stretching throughout the various stages of manufacturing activities till despatch.

Control valves used in feed water lines for duties, such as boiler start up, feed water pump re-circulation, water injection for de-superheater, etc. experience large pressure drops. Cavitation generated during throttling will cause severe problems such as erosion, vibration and noise. The newly developed model VHD is designed so as to divide a large pressure drop into many stages by the special construction of the plug and cage, thereby preventing occurrence of cavitation. The distribution of pressure is made effectively according to the characteristic of the process and the static pressure in the throttling region is kept above the saturated pressure.