GE Severe Service Valves masoneilan 77000 series Brochure download pdf (Page 6)

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Reﬁning

Continued global demand for improved production yields,

reduced pollutants, and increased plant effi- ciencies has led to

the use of the latest technology in refining and petrochemical

processes. The 77000 Series valve, with its unique features and

rugged design, is a leading technology platform that helps users

meet these demanding requirements.

Some of the most advanced refinery units in the industry are

those associated with hydroprocessing. The processes of

hydrocracking, hydrotreating, resid- hydrocracking, and catalytic

dewaxing can improve production yields from lower grade

feedstocks while also removing the damaging pollutants that

would prevent compliance with ever-increasing environmental

standards for fuels. These processes include critical applications

where control valves require a combination of high-pressure

letdown with cavitation prevention, passing of entrained solids,

and handling of multi-phase flow.

Well-proven in these environments for more than 30 years, the

77000 Series offers industry-leading technology to handle the

most difficult of applications in a reliable and safe package. The

unique combination of attributes of the 77000 Series has led to

its endorsement by many worldwide process technology owners

and licensors. It is common to see the 77000 Series design

specified by name in technical specifications for industry-leading

processes.

Hot High-Pressure Separator Valves

The combination of high-pressure reduction and high tempera-

tures, along with entrained gases and corrosive agents, makes

this application one of the most demanding processes in the

refinery. Operators require a control valve that can withstand

both erosion and corrosion, as well as a severe-service valve

that can manage high-pressure drops without the adverse

effects of noise, cavitation, and vibration.

An advantage of the 77000 Series’ expanding area trim

and wider outlet design is the proper handling of flashing/

off-gassing as the pressure is reduced and the fluid rapidly

expands in the valve outlet. The staged gas expansion, coupled

with the continuous plug guiding, minimizes vibration levels

while providing smooth control.

Available in stainless steels and advanced alloys, the 77000

Series valve offers long-term resistance to corrosive fluids. In

addition, the 77000 Series’ enlarged flow passages prevent

clogging caused by catalyst carryover, while preventing chok-

ing due to expansion of entrained gases. For a more robust

design and long-term wear protection, material options include

valve trim that is hardened by advanced material treatments

and hard-facing techniques.

PTA Crystallizer Blow Down Valves

Crystallizer blow down processes are highly demanding

petrochemical plant applications. As high-pressure steam is

let down to atmospheric conditions, the intense pressure drop

can lead to high noise and vibration. Unlike other steam vent

applications, this process typically includes particle carryover

that can clog the small holes employed to reduce noise in

traditional control valves.

The 77000 Series’ multi-stage energy management trim and

expanding area design deliver advanced noise and vibration

reduction without the need for small holes. Additionally, the

large flow path technology keeps the fluid moving smoothly

through the valve without clogging.

GE is committed to minimizing the impact

of our operations and products on the

environment through resource conservation,

pollution prevention, environmental

protection, and product innovation.

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GE Severe Service Valves masoneilan 77000 series Brochure Page 6

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