G-Stream
Globe valves
The G-Stream is the work-horse of the reciprocating valve offering. With a modern design that incorporates an advanced clamped-in seat ring and a double upper guide system.
It is available in a wide range of configurations and suitable for a wide variety of applications in continuous process industries. Its double-acting spring-cylinder
actuator ensures high actuation thrusts, pneumatic stiffness and excellent
performance levels.
The G-Stream is extremely versatile and can be supplied with several
options to meet the specific needs of each application.
| Sizes | 1/2’’ to 36’’ (15 to 900 mm) |
| Rating Class | ANSI 150 to 4500 |
| Body Materials | Carbon Steel, Chrome-Moly, Stainless Steel, Duplex, Hastelloy, Monel, Alu-Bronze, Titanium, Most other Alloys |
| End Connections | Integral Flanges (ANSI, UNI-DIN), BW, SW, Hub |
| Trim | Quick change seat, Stem guided or cage guided, Unbalanced or P/B design, Special trim |
| Actuator Features | Double Acting cylinder with spring for failsafe action, Electric, Hydraulic options |
| Versatile Configurations | Single seat, cage, angle, 3-ways, steam-jacketed, cryogenic, micro flow, bellows seal, low noise and anticavitation, reduced trims. Double top-stem guiding designed out of stream and large stem diameter ensures shutoff and no galling or sticking, Simple to service and maintain |
Three-Way
The Three-way G-Stream bodies are used in applications with converging flow (mixing action) or diverging flow (bypass action).
Most of the components are common with the globe-style valve, thus minimizing spare parts required for the plant maintenance.
Angle-Style Body
The “Angle-Body Style” G-Stream has the same components of the standard G-Stream globe-style valve, so it is fully interchangeable except for the body itself.
Depending on the application for which the valve is intended, the G-Stream valve with angle-style body may be supplied with an extended seat ring (venturi seat), that provides additional protection against the erosive action of the fluid.
Special Trim
Alpha & Beta
Alfa trim is a cage trim suitable for cavitating applications: the drilling scheme in the cage is designed in order to increase valve FL coefficient, to reduce cavitation bubble creation in the vena contracta. Beta trim is suitable for noise reduction: the micro-drilled cage increases the noise production frequencies, in order to maximize the transmission loss (piping noise absorption). Both Alfa and Beta trim are made with hardened material, in order to prevent galling phenomena between the plug and cage, and to maximize the life cycle of the valve. Alfa and Beta trim are available in the double cage configuration, for intermediate cavitation and noise reduction.
Epsilon & Delta
This type of trim is specific for extreme cavitation, severe flashing and noise reduction.
They are designed with the concept of the multi-stage – multi-path: fluid flow is divided in several independent channels where the pressure drop is split in multiple stages.
The number of stages, size and expansion ratio of the channels are designed for each specific application. Delta trim is manufactured by means of a disc stack, while Epsilon trim is an additive manufactured trim, and it guarantees a shortened lead time to market.
Both Epsilon and Delta trim are available in variable resistance configurations.
For example less stages from bottom to top of the stack, resulting in an increase of the incremental Cv along the travel.
Gamma
This type of trim is specific for extreme cavitation, severe flashing and noise reduction.
They are designed with the concept of the multi-stage – multi-path: fluid flow is divided in several independent channels where the pressure drop is split in multiple stages.
The number of stages, size and expansion ratio of the channels are designed for each specific application. Delta trim is manufactured by means of a disc stack, while Epsilon trim is an additive manufactured trim, and it guarantees a shortened lead time to market.
Both Epsilon and Delta trim are available in variable resistance configurations.
For example less stages from bottom to top of the stack, resulting in an increase of the incremental Cv along the travel.
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