Through Conduit Gate Valve

Parallel slide gate valve

Sometimes called a parallel disk gate valve, or parallel slide gate valve) operates in much the same way as a wedge gate valve, but the gate features two disks placed at a 90-degree angle to the fluid flow direction. They are generally seen as safer in high temperature applications, where the parallel design is less likely to result in thermal binding.

Application

GZP parallel slide gate valves featuring 'eyelet follower' design are specifically designed for use in high pressure water and steam applications, such as main steam isolation, boiler feed-pump isolation, feed heater isolation, spray water and general service isolation duty. Due to the eyelet follower design, the GZP parallel slide gate valve can be a solution in high velocity service applications where seat erosion and damage is problematic such as steam blow.

Features

● Excellent reliability

- Eyelet follower providing a smooth flow path and maximum performance

- Self cleaning action between disk and seat

- Welded-in seats hard

- FAced with Stellite or equivalent

- Seat surface protection provides extended life

● Low cost maintenance

- Expanded graphite pressure seal and gland packing

- Lower operating forces than wedge gate design

- Interchangability of parts

- Simplified seat refurbishment (only requires flat lapping, no critical angles to be matched to ensure sealing capability)

- Longer seat life with eyelet follower, due to reduced erosion

● Improved performance

- Lower pressure drop characteristic than wedge gate valve

- Minimized flow turbulence - Reduced actuator size/cost by 30% when compared to wedge gate

- Higher allowable seat velocity

- Improved sealing assisted by line pressure

- Low operating torque, seals on position not torque

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