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couplings for grooved-end pipe
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34
Fig. 7012
Gruvlok Flanges
A. The sealing surfaces A Max. to B Min. of the mating fange
must be free from gouges, undulations and deformities of any
type to ensure proper sealing of the gasket.
B. Gruvlok Flanges are to be assembled on butterfy valves so as
not to interfere with actuator or handle operation.
C. Do not use Gruvlok Flanges within 90 degrees of one another
on standard fttings because the outside dimensions may cause
interference.
D. Gruvlok Flanges should not be used as anchor points for tierods
across non-restrained joints.
E. Fig. 7012 Gruvlok Flange sealing gaskets require a hard fat
surface for adequate sealing. The use of a Gruvlok Flange
Adapter Insert is required for applications against rubber faced
valves or other equipment. The Gruvlok Flange Adapter Insert
is installed between the Gruvlok Flange sealing gasket and
the mating fange or surface to provide a good sealing surface
area.
F. Gruvlok Flanges are not recommended for use against formed
rubber fanges.
G. Contact Gruvlok for Di-Electric Flange connections.
Applications which require a Gruvlok Flange Adapter Insert:
1. When mating to a wafer valve (lug valve), if the valve is rubber
faced in the area designated by the sealing surface dimensions
(A Max. to B Min.), place the Gruvlok Flange Adapter Insert
between the valve and the Gruvlok fange.
2. When mating to a rubber-faced metal fange, the Gruvlok
Flange Adapter Insert is placed between the Gruvlok Flange and
the rubber-faced fange.
3. When mating to a serrated fange surface, a standard full-faced
fange gasket is installed against the serrated fange face and the
Gruvlok Flange Adapter Insert is placed between the Gruvlok
Flange and the standard Flange gasket.
4. When mating to valves or other component equipment where
the fange face has an insert, use procedure described in note 3.
Rubber Surface
Mating Flange
Component
with Serrated Face
Mating Flange
Gruvlok Figure 7012
Flange
Bmin.
Amax.
Grooved Pipe
Flange Adapter Insert
Flange Adapter Insert
Flange
Gasket
Gruvlok Figure 7012
Flange
Grooved Pipe
Mating Flange
GL-2.10