Valves and valve actuation – Mechanical movement actuator – Particularly packed or sealed
Patent
1993-02-26
1994-03-08
Fox, John C.
Valves and valve actuation
Mechanical movement actuator
Particularly packed or sealed
251329, F16K 302
Patent
active
052921050
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to knifegate valves.
Knifegate valves comprise a body, a knifegate, a gland box, actuating means for inserting the knifegate into the valve body and retracting it therefrom and support means for supporting the actuating means in spaced relation to the gland box and the body.
The gland box normally comprises a rectangular container having a lid containing a slot therein through which the knifegate is capable of passing. The side of the gland box opposite to the lid has a corresponding slot. The gland box is packed with a compressible material that is capable when compressed of forming a seal around faces and edges of the knifegate that passes through the gland box. The lid of the gland box is secured to the body usually by means of bolts in order to compressibly retain the packing within the gland box so that it forms an effective seal around the faces and edges of the knifegate.
It has now been discovered that the cost of producing such knifegate valves can be reduced by combining the functions of the actuator support means and the gland box securing means.
Accordingly the present invention provide an improved knifegate valve, the knifegate valve comprising:
a body, a knifegate, a gland box, actuating means for inserting the knifegate through the gland box into the valve body and retracting it therefrom,
support means for supporting the actuating means in spaced relation to the gland box and the body
and securing means for securing the gland box in such a way that it is capable of retaining packing contained therein in a compressed state, wherein the improvement comprises connecting the securing means to the support means.
The support means may comprise a bridge supported in spaced relation to the body by pillars connected to the body in which case the securing means may comprise nuts that are capable of cooperating with corresponding external threads on the pillars to secure the gland box lid to its base.
The actuating means may comprise a hand wheel having a central threaded bore and a corresponding spindle connected to the knifegate. The knifegate may also be pneumatically actuated or actuated by a solenoid. Alternatively the knifegate may be connected to a piston that is lever operated.
The body of the valve may be v-ported in order to provide for metering as well as providing greater control.
Knifegate valves find a broad array of applications in systems where it is necessary to control the flow rate of fluids within the system. Knifegate valves offer considerable control over the rate of flow of fluid through the valve since they are capable of operating anywhere between full bore and total closure. Industries in which knifegate valves are commonly used are the food and beverage processing industries, the pulp and paper stock industries and mineral processing industries. Typically a hand operable knifegate valve will have a body with a bore having an internal diameter in the range between 50 mm and 300 mm.
The packing preferably comprises polytetrafluorethylene-filled synthetic yarn. Packing of this type is suitable for use with liquids having a pH in the range between 4 and 10 and for temperatures up to 260.degree. C.
An embodiment of the invention will now be described with reference to the accompanying drawings in which
FIG. 1 is a side elevation partially in cross-section of a knifegate valve according to the invention and
FIG. 2 is an enlarged side elevation showing part of the knifegate depicted in FIG. 1.
FIG. 1 illustrates a knifegate valve 1 comprising a knifegate 2, a body 3 and a gland box 4. The valve has a bridge 5 supported in spaced relation to the body 3 by pillars 6. The bridge 5 has a central bore 7 for retaining the neck 8 of a hand wheel 9. The neck 8 has a centrally located threaded bore 10 through which a spindle 11 having cooperating external threads passes. The spindle 11 is connected to end 12 of the knifegate 2.
The gland box 4 comprises a base 13 integrally formed with the body 3 and a lid 14. The base has a peripheral flange 15 which has an ex
REFERENCES:
patent: 3000608 (1961-09-01), Williams
Fox John C.
Keystone International Holdings Corp.
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