Angle Pattern Single Stage and Multi stage Blowdown Valves


Blowdown Valves : Angle Pattern Single Stage and Multi stage design
Unique Feature(#300  upto #2500 rating valves):

•    Single piece  stem and plug assembly.
•    Non Rotating Stem design.
•    Rising Stem non rising hand wheel .
•    Roller Burnishing of Stem in Gland Packing section.
•    Special  designed Control Cone (SN 46)for use on  high pressure reduction/Throttling applications.
•    Single Stage Valve in Angle Pattern Block Body design with replaceable seat bush feature available for  high pressure  drop application and handling high flow.
•    Multi stage Valve in Angle Pattern Block Body design with replaceable seat bush feature available for high pressure drop application and high flow.
Benefits Specifications Technical Documents
Advantages due to Unique Feature:

•    Single piece  stem and plug assembly: No vibration of plug when the valve is kept semi open position. Cracking of Stellited seat due to High frequency vibration of plug when handling high pressure drop across valve seat is a common occurrence. Can be avoided by considering  this feature.               
•    Non Rotating along with Single Piece Stem and Plug Design feature ensures that the plug does not rotate when it sits on the valve seats. It also prevents damage to seat due to entrapped solid such as pipe scales or entrapped solid when the valve operator puts excess effort on handwheel to ensure tightness at seat.
•    Non Rising Hand wheel is ideal for use in areas where space between pipes is limited.
•    Roller Burnishing in Gland packing section gives a mirror finish to the spindle and helps reduce ware and tare of the gland packing. Effort required to operate the valve reduces due to reduced friction at the gland packing section due to this feature.
•    Control Cone feature (SN 46) with slots machined as per the valve discharge capacity. Valve plug specially designed such that there is no real flow till the plug seating area has move a minimum of 10% of the total lift away from the valve seat. This helps to separate the seating area from the throttling of High pressure reduction area. As a result the harmful effects of  cavitation and flashing do not affect the seating area of the valve enhancing the seat life .
•    Replaceable seat bush feature reduces maintenance down time  cost  considerably.
•    Need to only replace seat bush or valve stem  and  any other critically damaged part instead of replacing the full valve .