JPS5934073A - Control valve - Google Patents

Abstract

PURPOSE:To deter the occurrence of cavitation and prevent the generation of noise and erosion of a valve plug by providing a vertically movable valve plug having two, large and small, bodies against an inner port consisting of a small bore, a straight bore, and an enlarged bore. CONSTITUTION:A valve plug 8 moves in one with a valve shaft which moves up and down, allowing a fluid which enters an inlet port 2 from the X direction, to flow through the gap between a plug seat 9 of the valve plug 8 and a valve seat 4 into an inner port 3 and flows out in Y direction with its flow rate controlled. since the area of water passage between the small body 11 of the valve plug 8 and the small bore 5 of the inner port 3 is smaller than the area of opening between the seat 9 of the valve plug 8 and the small bore 5 of the inner port 3, the fluid is once held within the small bore 5 reducing the flow velocity of fluid flowing through the opening on the seat 9 side, while reducing its own pressure. The fluid flow is also reduced in the gap between the peripheal surface of the large body 10 of the valve plug 8 and the port wall of the enlarged bore 7 of the inner port 3, obtaining the necessary flow-rate characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a four-section button valve suitable for regulating the flow rate of a 915 body.

Firstly, a three-section valve has a part that has five properties that can be opened and closed, and it functions as a valve by changing the direction of flowing water. For this reason, in the control valve,
A certain flow rate and rapid changes in the flow path can cause the water to flow at a certain rate.
The L peephole may be raised, resulting in cavitation, which may cause noise and erosion of the channel wall surface.

Therefore, various proposals have been made for the purpose of preventing and preventing the occurrence of cavitation, but among these, one proposed for a valve equipped with a piston-type plug (Special Public Interest Publication No. 5)
2-2728), a decompression chamber with a water flow area smaller than the opening area of the valve is provided on the downstream side of the valve part.
Some valves provide resistance to flowing water to reduce the flow velocity at the valve part and suppress the occurrence of cavitation.

However, in this glazed device, in order to protect the valve seat, it is required to set the water flow area at the outlet of the decompression chamber so that it does not exceed the opening area of the valve. The disadvantage is that it is not possible to obtain highly accurate flow characteristics. Also, no dog 1 Ar Iti at the time of valve Zen Iji]
There is also the inconvenience of being severely restricted.

The duty, Ming, was made in view of the current situation, and includes a small diameter part with a lip on Bengetsu 4, a vertical wall part with a larger diameter than this small diameter part, and a hole wall. An extremely simple configuration in which a valve plug with two large and small body parts is provided in an inner hole formed in a zipper-like shape that expands toward the downstream side, and a valve plug with two large and small body parts is provided so as to be able to move up and down. (By this, it is possible to suppress the occurrence of cavitation as well as to prevent the valve plug from forming due to the occurrence of kC1 gavidynoyon.) This is an investigation into the "I-trade" dialect.

Hereinafter, its composition will be explained in detail in Punishment 11 depending on the case.

I(A), (+11 and (@) indicate the operating state of the control valve according to the present invention. 4 large circular valve PI 3 rings, ζJ tidal flow 1111 at the internal lower end
An inflow hole 2 is provided which communicates with the first passage of J (1). This inner hole 3 has a small diameter @ 115 adjacent to the valve seat 4 formed of a bundle of #4 slopes, and a vertical 1b wall portion that opens upward L1 at the same diameter as this small diameter portion 5 (114i). 6, and a diameter part γ which is connected to the vertical wall part 6 on the same line.The small diameter part 5 is formed by the hole wall extending in the direction of the lead 1b. , the vertical wall portion 6 is formed such that the hole wall has a diameter b larger than the small diameter portion 5 and extends in the vertical direction f', and the corrugated diameter portion 1 has the hole wall facing downstream. The valve plug 8 is formed in an expanding trumpet shape.The inner hole 3 is provided with a valve plug 8 screwed to a valve 11jt+ (not shown) so as to be movable in the upper direction. a seating portion 9 provided in the valve seat 4 and having a circumferential surface that is in close contact with the valve seat 4;
M wall part 6. Two large and small body parts 10 that fit inside the small diameter part 5
, 11, due to the separation between the seating portion 9 and the valve seat 4, the fluid flows from the direction shown by the arrow X to the direction K 3fM.
It is structured as it should be. A large number of bulges 2 are provided on the circumferential surface of the small body portion 11 of the valve glove 8, thereby providing resistance to the fluid by -1-F and reducing the pressure of the fluid.

As described above, in the configured Shinyo F, automatic usage j
141 jmu bI nyoru drive? 11) operation and ζJ manual operation tc causes valve 1qr+ to become J-,'V:j・b, and valve grab 8 becomes integral with #N! tL, arrow
’F part 9 of shiku 8 and concavity of 4L of valve off +<ial et al f
There was a lot of people in L3, and Ryuhi was also 111 in H31,
Apply to M1σ (indicated by arrow Y). Here, the water flow area between the small body part 11 of the valve glove 8 and the small diameter part 5 of the inner f1, 3 is [Opening between the seat part 9 of the valve plug 8 and the small diameter part 5 of the inner hole 3] Because it is smaller than the face shield, the fluid is once absorbed in the small diameter part 5 and then flows to the opening on the side of the seat part 9. By applying back pressure, the flow velocity of the fluid flowing through this fjij port is reduced, and the pressure itself is also reduced.Normally, the small body portion 11 of the valve psig 8 is
Since the J-shaped groove 12 is punched at v1, the fluid is further reduced in pressure within the vertical wall portion 6 due to the labyrinth effect. - force, body% 1 figure (in the state shown in Q, the valve plug 8
In the gap between the circumferential surface of the large force gap 1o and the hole wall of the inner hole 3 with a corrugation diameter of +31s 7? The I4r body is the most reduced. If wo1-plug 8 operates in a negative manner from this state, the wave diameter? 'j
fγ hole wall or lower 3i+tll! Since it is formed in a trumpet shape expanding toward l, the circumferential surface of the large trunk 10 and v1
Caliber: I! 7's Confucius and n; +; Caliber gii 7
b with the hole wall! I I] Thicker than the bloodline (l, seating part and 11, LE ili poverty II 7 no ryo 11 prefectural fee /ij
l + 'f#' Vsu14 is also reduced, 'tj
r constant? fr to r: Characteristics are added.

The actual t1 example is the vesicle 'fr+i1 of JP Norag 8.
Although an annular ring 1j'j 12 is provided on the circumference Lr of the inner hole 3, it may be formed on the hole wall of the vertical wall portion 6 of the inner hole 3. Further, if an annular groove is provided on both the circumferential surface of the small body portion 11 and the hole wall of the vertical wall portion 6, a further pressure reduction effect can be obtained.

As explained above, according to the present invention, there is a small diameter portion adjacent to the valve seat, a vertical wall portion having a diameter larger than the small diameter portion, and a corrugated diameter portion where the hole wall is formed in a trumpet shape. In addition to providing an inner hole with a valve seat iK, a valve plaque is provided in the inner hole with a seating portion that can fit tightly against the valve seat, and two large and small body portions whose curved surfaces fit into a vertical wall portion and a small diameter portion, respectively. (On the other hand, since it is provided so that it can move up and down, the fluid flows quietly, making it difficult for cavitation to occur, making it possible to reduce the generation of noise, and also to prevent erosion due to the occurrence of cavitation.) Due to the dj and 9 operations of the plug, 6ii: gj is restrained at each part of the inner hole by 11, so the degree of freedom is 64, and the degree of freedom is reduced to (47 or τ).Furthermore, , all 14 of the valves; 1 e ζ .

[Brief explanation of drawings]

Figure 1 (A), (TJ) and (0) are in this book: +
Section i'i indicating the operating state of the iii and d joints related to 8'J
°(1shil T,' i, ruru01... Valve P1≦3
Upper 1.3...inner hole, 4...ri 11"l!, 5...
... Edge tithe 1' (V, 6... Vertical wall assembly j, 7.
...Wave diameter? 311.8... Valve plug, 9...
・Oke 1': part, 10...large body part, 11...small body part, 12...annular groove.

Claims (3)

[Claims] (1) A small-diameter portion adjacent to the valve seat, a vertical wall ff1lj that has a larger diameter than the small-diameter portion and opens in both directions into the soil, and is connected to this vertical wall portion. The valve seat ring is provided with an inner hole consisting of an enlarged diameter portion formed in a trumpet shape whose hole wall expands toward the downstream side, a seating portion that can be brought into close contact with the valve seat, and a circumferential surface of the perpendicular wall portion. , Small 1] A control valve characterized in that a valve plug having two large and small body parts that fit inside the diameter part is provided so as to be movable up and down with respect to the inner hole. (2) The one-section valve according to claim 1, wherein an annular l# is provided on the circumferential surface of the small body portion of the valve plug. (3) The control valve according to claim 1, wherein an annular groove is provided in the vertical wall of the inner hole.