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Parallel slab gate valve usually has excellent reliability. It can do self cleaning between disk and 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. A gate valve seals off flow when a slab is either raised, which is a normal acting, or lowered, which is a reversed acting, so that the hole through the slab no longer lines up with the pipe. Parallel slab 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.
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