(1) Yoke Sleeve – aluminum-bronze yokesleeve has needle type thrust bearings to minimize operating torque.

(2) Stem –

• Threaded to carrier
• Pinned and tack welded
• Provides stability

(3) Pressure Seal – uncomplicated design has segmented retaining ring and mild steel silver plated gasket to aid disassembly and provide maximum bonnet seal.

(4) Seat Ring – welded-in seat rings are perpendicular to the flow bore for easy maintenance.

(5) Actuators – valves can be supplied with any type of electric, hydraulic or pneumatic actuator. Standard manual handwheels on valves 12" and smaller with 14"and larger bevel gear operated.

(6) Yoke – fully fabricated yoke is seismically qualified while offering easy maintenance and actuator mounting.

(7) Gland – two piece, self-aligning gland eliminates cocking.

(8) Integral Backseat – hardfaced for maximum life.

(9) Discs – Spring loaded discs are self-aligning and reduce actuator torque requirements.

(10) Integral Stop – Integrally cast carrier stop positions carrier disc assembly for reliable seating.

Parallel Seat gate valve

Parallel seat gate and seat ring construction can be furnished for high differential pressure services or where high piping loads or thermal expansion may cause sticking of a wedge type gate. The parallel seat gate assembly consists of two interchangeable spring loaded discs, a fully guided disc carrier, and retaining pins.

Position seating eliminates stress and potential binding due to thermal expansion of the stem. Spring loaded discs help affect a tight seal in low differential pressure services. Discs are interchangeable which simplifies in-line maintenance and eliminates the need to custom fit the seats to the discs. Internal stops provide positive over travel protection for power actuated valves and act as a reference to position the discs in the open and closed positions. This design features low seating torque which reduces actuator size and cost. Hardfaced seating surfaces provide high cycle capability in very high differential pressure services.

Features

• Self aligning interchangeable discs
• No wedging force; disc reacts freely to thermal changes
• Uniform seat wear
• Positive disc travel stops cast into body
• Lower torque may allow smaller actuator
• Ease of maintenance
• Position seated for closure