50mm V-Band Blow off Valve - GFB SV50 & SV52

GFB SV52 - T9052

In the race to create the most compact and highest flowing blow-off valve, GFB’s SV52 pulls ahead of the pack.

Standing only 86mm tall (including the weld-on adaptor), the SV52 is 10mm shorter than the nearest competitor, AND flows more!

Consider these questions when you’re looking for a BOV for your high-powered, forced induction engine:

Will it handle the pressure?…………………………….. YES! Is 300psi enough?
Will it flow enough?…………………………………………   YES! It outflows everything else in its class!
Is it small enough to fit my engine bay?…………..YES! 10mm shorter than the nearest competitor!
Will it last?…………………………………………………………. YES! It comes with a lifetime warranty!

Strength is important;

Realizing that a high-flowing valve like this will see duty in some high-boost environments, we made sure the SV52 tops the class in that category as well, giving it an astonishing boost pressure rating of 300psi!

The SV52 also includes 2 springs PLUS a spring pre-load adjustment system so you can dial it in for optimum throttle response and boost recovery after gearshift, without resorting to the costly hit- and-miss approach of purchasing extra springs.

**Suits engines with manifold vacuum ranging from 5-22inHg (17-74.5kPa, 2.5-11psi vacuum)

» BODY

The SV52’s unparalleled pressure capacity starts with a monobloc body design, CNC machined from a single aluminium billet that ensures strength without adding unnecessary bulk.

» PISTON

The anodized piston bore creates an extremely hard and low-friction surface on which the single piece aluminum 52.5mm piston glides, and will continue to do so over countless cycles. It features an arrangement of Viton o-ring seals unique to GFB.

One is positioned on the face of the piston to seal incoming boost pressure, the other rides in a groove on the piston that engages the specially shaped cylinder wall with varying amount of compression, to ensure optimum sealing when the valve is closed, and low friction during the opening and closing movements.

» DESIGN

Why do we use a piston instead of the more common diaphragm design?

Strength and reliability is the primary factor, something that a diaphragm simply cannot match in a high-boost BOV environment. Diaphragms have their place (we use them in our wastegates), as they offer low friction and good sealing capability. However, a rolling diaphragm is only designed to receive a net pressure on one side, which essentially “inflates” it against the walls of the chamber in which it resides, exactly how it is used in a wastegate.

However, a BOV is exposed to frequent pressure reversals – every time you accelerate and lift off.
For a diaphragm, this means it is repeatedly collapsing on itself under boost, then inflating under vacuum. Eventually, this leads to diaphragm failure. A piston on the other hand is immune to this issue, and will continue to operate under the most extreme pressure, temperature, and cyclic conditions.

The unique mounting method of the SV52 is one of the ways we’ve been able to save unnecessary bulk.
By eliminating the v-band style mount, the piston and its venting ports can sit much lower, which reduces the overall height to a number others can’t match.

$399.00
$379.00
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GFB SV50 Big HP 50mm V-Band BOV Blow off Valve NZ
GFB SV50 Big HP 50mm V-Band BOV NZ




 

The NEW GFB SV50!

The only BOV rated at over 300psi

(That’s more boost than 13 stock Mitsubishi Evo Xs combined!)

GFB’s New SV50; the highest flowing blow-off valve in the GFB range, capable of supporting IMMENSE horsepower!

What makes the SV50 stand out from the crowd?

Take note, diesel guys - the SV50 has the strength to withstand over 300psi without breaking a sweat! Try doing this with a diaphragm-type BOV!

The SV50’s single-piece billet monoblock body design eliminates the need for fasteners and a separate cap, making it stronger and more compact.

The one-piece brass piston does not use a diaphragm. This ensures strength and reliability for the life of the valve.

Adjustability - other brands require you to pay extra for different springs to set the valve up to the engine’s idle vacuum. The SV50 can be used on applications with manifold vacuum ranging from 5-22”Hg (2.5-11psi vacuum).

New High flowing valve able to withstand immense pressures

Suits all High Powered Turbo or Supercharged Engines

The SV50 uses a v-band mounting system that is compatible with existing common v-band flanges. The billet hinged clamp design is both easier to use and stronger than other flexible band-clamp designs on the market.

image-2

Why do we use a one-piece brass piston instead of a diaphragm like other brands?

For good reason - good quality diaphragms are typically constructed from silicone and reinforced with a nomex cloth, and are usually a“rolling” design that allows relatively long piston strokes.

However, this design has its limitations. The most significant being they are only designed to have pressure applied to one side, which is the underside. The nomex reinforcing is on the top of the diaphragm, so that the silicone is blown INTO the cloth. Applying pressure to the cloth side can result in the silicone material de-laminating from the cloth. Secondly, applying pressure to the wrong side of a rolling diaphragm causes the bellow section to collapse on itself. This creases the nomex reinforcing, and also causes friction and wear as the piston starts to move when the pressure changes to vacuum.

BOVs must deal with both pressure and vacuum, combined with the fact that competitors’ products use wastegate diaphragms constructed the wrong way around for use in a BOV, meaning a diaphragm is not the ideal solution.

By using a robust and proven piston design, and carefully machined to close tolerances, the SV50 eliminates the diaphragm and the problems associated with them when used in a BOV. This is how the SV50 can be made to withstand such high boost pressures.


The SV50 comes with two springs and an adjustment screw, with which you can set the SV50 up for idle vacuum ranges from 5-22”Hg (2.5-11psi vacuum). This range covers anything from superchargers or all-out race cars, all the way to street driven cars with stock cams and high idle vacuum.

Other brands rely on swapping springs to set the valve up to the engine’s idle vacuum. Springs that you have to pay extra for.

The SV50’s v-band clamp is machined from billet, but that’s not the unique feature. Competitors’ one-piece designs rely on bending the clamp material to open up the clamp, with difficulty. Repeated bending will also cause the material to fracture. GFB’s 2-piece hinged design solves this problem by opening wide for easy installation and lasting longer than other designs.


GFB 50mm BOV - SV50
$399.00
$379.00
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  • Shipping Time: 1-2 days1
GFB Wastegate - GFB BOV - GFB Boost Controller - Save Money & Buy as a Combo Package

Use the Drop Down Menu to choose from a selection of Combo Packages from the range of GFB Blow off Valves, GFB Wastegates & GFB Boost Controllers. If you require a different package than you see in the menu let us know what you need and we'll be in touch with a personally priced package for you...

$613.00
$549.00
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  • Shipping Time: 1-2 days1

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