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Parallel gate valve can be used in a varity of applications, such as blow down service, blow off service, gland steam system drains, steam turbine inlet isolation, economizer recirculation, spray water, attemperator spray, and steam blow and start up.
Parallel gate valve usually has excellent reliability. It has self cleaning action between disk & seat, low cost maintenance, lower operating forces than wedge gate design, interchangability of parts, simplified seat refurbishment, which only requires flat lapping, no critical angles to be matched to ensure sealing capability.
Parallel gate valve has other improved performance. When compared to wedge gate it has lower pressure drop characteristic, reduced actuator size/cost by 30%. It also has improved sealing assisted by line pressure, and low operating torque, seals on position not torque.