GE Severe Service Valves masoneilan 77000 series Brochure download pdf (Page 3)

77000 Series - Axial Flow Labyrinth Trim Control Valves | 3

Multi-Stage, Expanding Area

Pressure Reduction

Using proven principles of energy management technology,

the 77000 Series gradually reduces fluid pressure, yielding

dramatically reduced noise and vibration. The product features

a multi-stage trim design that creates flow path friction to

simulate the gradual pressure loss that occurs over long

pipelines. This effect is produced by passing the fluid through a

tortuous flow pattern with multiple restrictions, referred to as

pressure reduction stages. Consequently, energy is dissipated

through high head loss without undesirable shock waves.

By reducing fluid velocity throughout the throttling process, the

77000 Series’ advanced design eliminates the damaging erosive

effects caused by high kinetic energy spikes and vibration.

The unique flow area of the 77000 Series trim gradually

increases at successive trim stages and offers an enlarged

outlet connection. The expanded flow areas are designed

to compensate for the change in gas density resulting from

pressure reduction, thus making the 77000 Series well-suited

for high-pressure-drop off-gassing applications. With more

than 30 years of installed experience, the Masoneilan 77000

Series has performed successfully in some of the most extreme

high-pressure-drop environments. The 77000 Series’ advanced

design results in minimized fluid velocity, which reduces erosion

damage to the trim and downstream process equipment,

particularly in applications—such as wellhead chokes in the oil

and gas industry—that include particulate in the flow stream.

Additionally, the 77000 Series’ low velocity outlet area minimizes

phase transformation process effects. That is an advantage for

many applications that experience flashing or hydrate service

conditions, such as startup valves in supercritical power plants,

hot high-pressure separator letdown valves in refineries, and

gas injection valves in gas extraction plants.

Proven Control

Through Advanced Design

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GE Severe Service Valves masoneilan 77000 series Brochure Page 3