CN205173597U - Low noise relief pressure valve - Google Patents

Abstract

The utility model discloses a low noise relief pressure valve has the valve body, and two ends of valve body horizontal direction are equipped with central line unanimous inlet opening and apopore, and the upper and lower spiro union of valve body has last valve gap and descends the valve gap, the valve gap have with the same central line of infusion set vertically, be equipped with the horizontal partition wall of intercalary band screw in the valve body, going up the valve gap below and being equipped with the diaphragm, upward the valve gap compresses tightly the annular periphery of diaphragm, is provided with spring unit in the cavity that diaphragm and last valve gap formed, being cooperated and forming a plurality of valve ports with the disk seat by valve stem assembly in the cavity of diaphragm and valve gap formation down, spring unit and valve stem assembly have same central line. The utility model discloses a two or more valve ports carry out multistage throttle to the medium that flows, make high pressure drop rational distribution on each valve port, like this the pressure drop to every valve port reduce by a wide margin to reduce the velocity of flow when medium stream advances the valve port, reduced the noise, prevented the production of vibration and cavitation.

Description

Low noise reduction valve

Technical field

The utility model relates to a kind of reduction valve, particularly relates to a kind of low noise reduction valve.

Background technique

Hydraulic pressure higher for pipeline before valve can be down to the hydraulic pressure after valve needed for pipeline by reduction valve, effectively be situated between determined water supply system pressure regulate problem, ensure that water supply system respectively obtains suitable hydraulic pressure and flow with water spot, be therefore widely used in the occasion such as region, mine that tall building, city water-supply pipe network hydraulic pressure are too high.The adjustable compression release valve supplied in the market is single valve mouth, the shortcoming of this structure is, when Pressure reducing ratio is larger, High Pressure Difference can all concentrate on the valve port that is made up of flap and valve seat, because valve port opening is at that time very little, consequent high speed flow cognition is washed away valve port, thus produces howling and vibration, even cause cavitation to cavitate, shorten the life-span of valve widely.

Summary of the invention

The utility model mainly solves the deficiency existing for prior art, thus two or more valve ports of a kind of employing of exploitation, multistage throttle is carried out to the medium of flowing, makes the low noise reduction valve of high pressure drop reasonable distribution on each valve port.

Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals: a kind of low noise reduction valve, there is valve body, valve body substantially horizontal two ends are provided with the consistent water inlet of center line and osculum, on valve body, under be bolted with bonnet and bottom flange, described valve gap has the same center line vertical with horizontal center line, it is characterized in that: the horizontal partition wall being provided with Intermediate Gray screw in described valve body, screw on described horizontal partition wall is consistent with the center line of the screw at valve body Vertical direction two ends, diaphragm is provided with below bonnet, the circular periphery of diaphragm compresses by bonnet, spring assembly is provided with in the cavity that described diaphragm and bonnet are formed, coordinated with valve seat by valve rod assembly in the cavity that described diaphragm and bottom flange are formed and form some valve ports, described spring assembly and valve rod assembly have same center line.

The technical solution of the utility model can also be perfect further:

As preferably, in the screw of described horizontal partition wall, spiro has valve seat cover, there are a through hole in the central authorities of described valve seat cover, have a circular groove in inner chamber, and the annular sword limit that the upper intersecting line of through hole and circular groove and valve seat overlap lower end is respectively as the valve seat of valve port one and valve port two.

As preferably, the sealing gasket that described valve rod assembly comprises valve rod, is set in the gasket base on valve rod and is arranged in gasket base groove; There is a bulge loop in the stage casing of described valve rod, and the upper plane of bulge loop and sealing gasket are respectively as the flap of valve port one and valve port two, and the spacing between two flaps is equal with the spacing of two corresponding valve seats; Described valve seat overlaps the external diameter of diameter slightly larger than bulge loop of center through hole.

As preferably, described valve rod is connected with diaphragm by connecting little axle nut.

As preferably, described spring assembly comprise spring, spring seat, pressing plate, adjusting screw and and female; Described lower spring end mounts elastically, and upper end is provided with pressing plate, pressing plate is connected with adjusting screw and and mother.

As preferably, bottom flange and valve seat inner room are provided with filter screen.

The utility model beneficial effect is:

Innovative point of the present utility model adopts the medium of multiple valve port to flowing to carry out multistage throttle, make high pressure drop reasonable distribution on each valve port, so each valve port pressure drop is significantly reduced, significantly reduce noise, vibration and cavitation cavitation erosion, extend the life-span of valve port.Prove through test, noise can reduce 6dB (A) left and right.

Accompanying drawing explanation

Accompanying drawing 1 is a kind of structural representation of the present utility model.

Description of reference numerals: 1, adjusting screw, 2 and female, 3, pressing plate, 4, spring, 5, bonnet, 6, nut, 7, spring seat, 8, diaphragm, 9, connect little axle, 10, valve body, 11, valve rod, 12, valve seat cover, 13, sealing gasket, 14, filter screen, 15, gasket base, 16 seal rings, 17 bottom flanges;

A, water inlet, B, osculum, d, center through hole, V1, valve port one, V2, valve port two, W, horizontal partition wall, P1, import hydraulic pressure, P2, outlet hydraulic pressure.

Embodiment

Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.

Embodiment:

Low noise reduction valve as shown in Figure 1, female 2, pressing plate 3, spring 4, bonnet 5, nut 6, spring seat 7, diaphragm 8 by adjusting screw 1, is connected the parts such as little axle 9, valve body 10, valve rod 11, valve seat cover 12, sealing gasket 13, filter screen 14, gasket base 15, seal ring 16 and bottom flange 17 and forms.The hole at valve body 10 substantially horizontal two ends is respectively water inlet A and osculum B, and water-in and water-out centerline hole is consistent; The screw at valve body 10 Vertical direction two ends is consistent and vertical with water-in and water-out centerline hole with the center line of the screw on by-level partition wall W; In valve body upper end hole, spiro has bonnet 5 and the circular periphery of diaphragm 4 is compressed, be provided with in the cavity that bonnet 5 and diaphragm 8 are formed spring 4, spring seat 7, pressing plate 3, adjusting screw 1 and and female 2; In lower stomidium, spiro has bottom flange 17, and has seal ring 16 to prevent medium from leaking; In the screw of by-level partition wall W, spiro has valve seat to overlap 12, is provided with filter screen 14 between bottom flange 17 and valve seat cover 12; Valve rod 11 connects to one with sealing gasket 13 and gasket base 15, and its upper shaft lever and the valve seat endoporus overlapped above in the of 12 is slided and joined, and the endoporus of its lower axostylus axostyle and bottom flange 17 is sliding joins, and therefore valve rod assembly is led can freely up and down be moved by above-mentioned two endoporus; Valve rod 11 is connected with diaphragm 8 by the little axle 9 of connection and nut 6.

After installing, the center line of above-mentioned each part is consistent with the center line of valve body about 10 screw.There are a through hole d in the central authorities of valve seat cover 12, have the upper intersecting line of a circular groove through hole and circular groove and valve seat to overlap the valve seat of annular sword limit respectively as valve port one V1 and valve port two V2 of 12 lower ends in inner chamber; There is a bulge loop in the stage casing of valve rod 11, and the upper plane of bulge loop and sealing gasket 13 are respectively as the flap of valve port one V1 and valve port two V2, and the spacing of two valve seats is equal with the spacing between two corresponding flaps.Valve seat overlaps the external diameter of diameter slightly larger than bulge loop of 12 center through hole d.

Working principle

When up time turning adjusting screw 1, promote diaphragm 8 move down through pressing plate 3, spring 4, spring seat 7, valve port is opened, water enters osculum B by water inlet A through filter screen 14, valve port two V2 and valve port one V1, the water pressure pushing diaphragm 8 of osculum B moves upward, valve port is turned down, thus the flow velocity of the water flowing through valve port is increased, the pressure loss also increases thereupon, outlet pressure is declined, after the thrust acted on below diaphragm 8 and spring force balance, reduction valve just has a certain size Output pressure, and therefore the tightness of Regulation spring 4 can adjust the size of mouth pressure.

Once after the setting of outlet hydraulic pressure, if import hydraulic pressure or flow fluctuate, so reduction valve can utilize the structure of self to regulate, if make the hydraulic pressure of outlet substantially remain unchanged. the instantaneous rising of import hydraulic pressure, outlet hydraulic pressure also must increase, and destroys and originally acts on equilibrium of forces on valve rod 11, diaphragm 8 moves, valve port turns down, and expenditure and pressure is used saliva and pushed back the pressure dropped to close to former setting, and valve rod 11 obtains new balance in new position.Otherwise if hydraulic pressure reduces instantaneously, diaphragm 8 moves down, valve port opening increases, and throttling action reduces, and outlet pressure goes back up to close to former set pressure.

If flow increases, so MEDIA FLOW increases through the flow velocity of valve port, and the pressure loss increases thereupon, causes outlet pressure to reduce, and diaphragm 8 moves down, and valve port opening increases, and throttling action reduces, and outlet pressure is gone up extremely close to former set pressure.Otherwise if flow reduces, diaphragm 8 moves, and valve port opening turns down, expenditure and pressure, makes outlet pressure be down to close to former setting.

Why lower surface analysis the utility model can reduce noise.From fluid mechanics principle, MEDIA FLOW has following relation through the flow 0 of restriction with the pressure differential deltap P before and after restriction:

$Q=CA\sqrt{\mathrm{\Δ}P}\mathrm{...}\left(1\right)$

In formula:

0-MEDIA FLOW is through the flow of restriction

The flow coefficient of C-restriction is constant to a certain restriction C

The sectional area of A-restriction

Pressure reduction before and after Δ P-restriction

0＝A·V………(2)

In formula:

V-MEDIA FLOW is through the flow velocity of restriction

(2) formula is substituted into (1) formula obtain:

$V=C\sqrt{\mathrm{\Δ}P}\mathrm{...}\left(3\right)$

From (3) formula, the Δ P before and after restriction increases, and MEDIA FLOW through the speed V of restriction is doubly increase.When V exceedes certain value, noise, vibration will be produced, even cavitation cavitation erosion.Common reduction valve is owing to only having a valve port, and under the condition that Pressure reducing ratio is large, Δ P is very large, and High Pressure Difference all concentrates on a valve port, and therefore, MEDIA FLOW, through the very high speed of valve port, often produces very high noise.The utility model has two valve ports, under high Pressure reducing ratio service condition, High Pressure Difference is dispensed on two valve ports, therefore the front and back pressure reduction of each valve port is 1/2nd of single valve mouth, therefore under same flow condition, MEDIA FLOW significantly reduces through the flow velocity of valve port, and flow velocity is 70.7% of single valve mouth as calculated, if adopt three valve ports, flow velocity is 57.7% of single valve mouth.Therefore reduce medium washing away valve port widely, significantly reduce noise, vibration and cavitation cavitation erosion, extend the life-span of valve port.

Claims (6)

1. a low noise reduction valve, there is valve body, valve body substantially horizontal two ends are provided with the consistent water inlet of center line and osculum, on valve body, under be bolted with bonnet and bottom flange, described valve gap has the same center line vertical with horizontal center line, it is characterized in that: the horizontal partition wall (W) being provided with Intermediate Gray screw in described valve body (10), screw on described horizontal partition wall is consistent with the center line of the screw at valve body Vertical direction two ends, diaphragm (8) is provided with below bonnet, the circular periphery of diaphragm (8) compresses by bonnet (5), spring assembly is provided with in the cavity that diaphragm (8) and bonnet (5) are formed, coordinated with valve seat by valve rod assembly in the cavity that diaphragm (8) and bottom flange (17) are formed and form some valve ports, described spring assembly and valve rod assembly have same center line.

2. low noise reduction valve according to claim 1, it is characterized in that: in the screw of described horizontal partition wall (W), spiro has valve seat cover (12), there are a through hole (d) in the central authorities of described valve seat cover (12), have a circular groove in inner chamber, the upper intersecting line of through hole and circular groove and the annular sword limit of valve seat cover (12) lower end are respectively as the valve seat of valve port one (V1) and valve port two (V2).

3. low noise reduction valve according to claim 2, is characterized in that: the sealing gasket (13) that described valve rod assembly comprises valve rod (11), is set in the gasket base (15) on valve rod and is arranged in gasket base groove; There is a bulge loop in the stage casing of described valve rod (11), and the upper plane of bulge loop and sealing gasket (13) are respectively as the flap of valve port one (V1) and valve port (V2), and the spacing between two flaps is equal with the spacing of two corresponding valve seats; The diameter of described valve seat cover (12) center through hole (d) is slightly larger than the external diameter of bulge loop.

4. low noise reduction valve according to claim 3, is characterized in that: described valve rod (11) is connected with diaphragm (8) by the little axle of connection (9) and nut (6).

5. low noise reduction valve according to claim 1 and 2, is characterized in that: described spring assembly comprise spring (4), spring seat (7), pressing plate (3), adjusting screw (1) and and female (2); Described lower spring end mounts elastically, and upper end is provided with pressing plate (3), pressing plate is connected with adjusting screw (1) and and female (2).

6. low noise reduction valve according to claim 1 and 2, is characterized in that: between bottom flange (17) and valve seat cover (12), be provided with filter screen (14).