Babcock - Model 87 -Parallel Slide Gate Valve

The parallel slide gate valve is an alternative to double disc valves, having two discs but only one wedge instead of two. The discs are in permanent contact with the seat rings, getting a tight seal due to the horizontal inconel spring located in between and without the wedging system help.

The complete guiding system is precisely machined for ensuring a smooth open and close operations and eliminating vibrations.

The parallel slide gate valve is recommended to be used for clean fluids and steam applications and for medium or high pressure service.
A wide range of construction materials, actuation systems and accessories are available for each case.

• Two discs and just one wedge design gate valve.
• Parallel slide gate valve provides a smooth flow path between seats.
• This design of gate valve is commonly used for clean fluids and steam applications.
• System pressure is used to provide isolation. The closing is only made over one of the seats. The higher pressure in the system, the better closing tightness.
• The discs have a certain movement to assure its right alignment with the seats contact faces when closing (seal is established on outlet seat face only), avoiding any mechanical stress.
• The inconel spring located between both discs, provides initial seating force. Once the discs are in the right position, no additional torque is necessary to achieve a positive seal.
• Torque requirement is lower than other gate valves as wedge type because needs lower operative forces.
• The wiping action of the discs over seats while the valve is operating removes debris and prevents premature wear of the components. A long life service is guaranteed by means of hardening seats and discs with an extra hard material as Stellite 6, Tribaloy or others.
• Parallel slide system avoids jamming related to cooling down of the pipeline.
• A wide range of construction materials, actuation systems and accessories are available for each case.

• Type: Parallel Slide
• Bonnet: Bolted
• Sizes: 2″ – 48″
• ANSI Class: 150-900