CN201344237Y

CN201344237Y - Double-metal valve rod nut for gate valve

Info

Publication number: CN201344237Y
Application number: CNU2008202331244U
Authority: CN
Inventors: 李京孝
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-12-25
Filing date: 2008-12-25
Publication date: 2009-11-11
Anticipated expiration: 2018-12-25

Abstract

The utility model discloses a double-metal valve rod nut for a gate valve, belonging to the field of valves. The nut is only applicable to gate valves with nominal pressure of PN1.6-6.7MPa and nominal diameter of DN50-300mm, gray cast-iron gate valves with nominal pressure of PN1.0MPa and nominal diameter of DN50-450mm, as well as diaphragm valves with nominal pressure of PN0.6MPa and nominal diameter of DN15-20mm. The double-metal valve rod nut comprises a nodular cast-iron or carbon steel base body(1) provided with internal screw threads, and is characterized in that a copper alloy layer(2) is compounded in the nodular cast-iron or carbon steel base body(1) and a gold imitating coating is plated on the outer surface of the base body(1). By compounding a copper alloy layer in the nodular cast-iron or carbon steel base body(1) provided with internal screw threads, the utility model reduces the fabricating cost and saves more than 95% of nonferrous metal, and since the gold imitating coating is plated on the outer surface of the entire valve rod nut, the valve rod nut can not have rust, thus greatly improving the service life.

Description

Bimetal gate valve rod nut

Technical field

The utility model relates to a kind of bimetal gate valve rod nut, belongs to valve field.This nut only is suitable for nominal pressure PN1.6-6.4MPa, the gate valve of inside nominal diameter DN50-300mm; Nominal pressure PN1.0Mpa, the gray cast iron gate valve of inside nominal diameter DN50-450mm; And nominal pressure PN0.6Mpa, the membrane valve of inside nominal diameter DN15-20mm.

Background technique

The Stem Mut of gate valve stipulates it is ZCuZn38Mn2Pb2, ZCuAI9-4, ZCuZn40Mn3Fe1 according to the material of People's Republic of China's Machinery Ministry standard (JB1699-91, JB1698-91, JB1701-91).Because the price of copper resource constantly rises in recent years, the valve industry was tested a lot of substitution material in order to reduce cost of material, as patent No. ZL200720018492.2 Bimetallic valve stem nut, owing to adopt outer flip sleeve of Cuprum alloy and plain cushion, the manufacture cost height, the easy corrosion of outer surface simultaneously, afunction, reduction of service life.

The model utility content

According to above deficiency of the prior art, problem to be solved in the utility model is: provide that a kind of cost is low, long service life, non-corrosive, intensity height, the bimetal gate valve rod nut being convenient to reclaim.

The technological scheme that its technical problem that solves the utility model adopts is: this bimetal gate valve rod nut, comprise the nodular cast iron or the plain steel that have internal thread, it is characterized in that: compound layer of copper alloy-layer in described nodular cast iron, the plain steel, outer surface of matrix imitation gold plating coating.

Outer surface of matrix imitation gold plating coating is the 4-6 micron.Can prevent surface corrosion effectively.

The intensity and the anti-attrition using effect of trapezoidal nut friction pair in only considering, its material is selected according to mechanical industry standard.The Cuprum alloy of inner trapezoidal thread and surperficial anti-attrition layer trapezoidal thread and steel base adopt High Temperature High Pressure centrifugal action simultaneously, make it form extremely firm molecular bond and compoundly are one.Its two kinds of formed adhesive strengths of metal are not less than wherein a kind of tensile strength of metal.

The beneficial effect that the utility model bimetal gate valve rod nut is had is: compound layer of copper alloy-layer in nodular cast iron by will having internal thread or the plain steel, reduce manufacture cost, and save non-ferrous metal up to more than 95%; Be steel base owing to what adopt again, only take surface hardening to improve its hardness number, can satisfy the difference of hardness of the coupling surface of nut and support friction pair on the nut surface; Because electroplate one deck imitation gold deposit at whole Stem Mut outer surface, non-corrosive has improved working life greatly; The convenient recycling, nonferrous materials can be used lathe, drilling machine, drilling goes out non-ferrous metal and partly gets final product, and also can use the thawing method, melts non-ferrous metal, can also recover the inner trapezoidal thread that has damaged with the compound again non-ferrous metal of going up of secondary composite algorithm.The utility model meets on the basis of NBS reasonable in design, satisfies usage requirement, has more to be worth and functional.

Description of drawings

Fig. 1 the utility model embodiment 1 structural representation;

Fig. 2 the utility model embodiment 2 structural representation;

Fig. 3 the utility model embodiment 3 structural representation.

Wherein: 1, matrix 2, copper alloy layer 3, imitation gold deposit.

Embodiment

Below in conjunction with accompanying drawing embodiment of the present utility model is described further:

Embodiment 1:

As shown in Figure 1, the gate valve rod nut of sliding friction is by nodular cast iron or plain steel 1, the compound one deck trapezoidal thread of matrix 1 inner plane copper alloy layer 2.Two kinds of metals are in High Temperature High Pressure while centrifugal action, form the molecule covalent bond, and are combined into one.

Embodiment 2:

As shown in Figure 2, the gate valve rod nut of sliding friction is by nodular cast iron or plain steel 1, compound layer of copper alloy-layer 2 on the trapezoidal thread in the matrix 1.Two kinds of metals are in High Temperature High Pressure while centrifugal action, form the molecule covalent bond, and are combined into one.Copper alloy layer 2 thickness are about 1mm.

Embodiment 3:

As shown in Figure 3, the gate valve rod nut that possesses rolling friction is by nodular cast iron or plain steel 1, compound layer of copper alloy-layer 2 on the trapezoidal thread in the matrix 1.Two kinds of metals are in High Temperature High Pressure while centrifugal action, form the molecule covalent bond, and are combined into one.Copper alloy layer 2 thickness are about 1mm.

Making method:

Matrix 1 is selected the quenching with Subsequent tempering of 45# carbon junction steel, selects according to its valve work condition state.Two kinds of metal composite junction planes comprise that straight line is compound and internal thread is compound, and the following trapezoidal thread in T26 * 5 is selected Planar Compound in principle, and as embodiment 1, the above trapezoidal thread in T26 * 5 selects internal thread compound, as embodiment 2 and embodiment 3.Also can select this two kinds of different complex forms arbitrarily according to customer requirements.

For satisfying the operating mode usage requirement of gate valve, can carry out surface hardening to matrix 1 and improve its surface hardness.

Matrix 1 can also adopt other non-non-ferrous metals to make, and copper alloy layer 2 has can also adopt other non-ferrous metal layers.

Claims

1, bimetal gate valve rod nut comprises the nodular cast iron or the plain steel (1) that have internal thread, it is characterized in that: compound layer of copper alloy-layer (2) in described nodular cast iron, the plain steel (1), matrix (1) outer surface imitation gold plating coating (3).

2, bimetal gate valve rod nut according to claim 1 is characterized in that: imitation gold deposit (3) is the 4-6 micron.