RU2375625C2 - Method of unloading two-saddle valve gate - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention refers to pipeline accessories, particularly to two-saddle valves and is designed for utilisation in branches of industry for regulating parametres of processes related to liquid and gaseous mediums. Here is disclosed the method of unloading the two-saddle valve gate wherein flow of working medium in a between-saddle chamber is divided in two parts. Flow of working medium is divided with a partition into two parts after an inlet branch. These parts of flow are directed into opposite sides into above-saddle chambers. Further, from the above-saddle chambers flows of working medium enter a between-saddle chamber This chamber is divided into two between-saddle chambers with another partition. Then each of these flows is divided into two flows. These flows are directed into opposite directions and actuate the lock in opposite directions. The flows envelope the partition from sides and come into an outlet branch.

EFFECT: increased reliability, regulation of working medium flow, elimination of one-side wear of valve, elimination of valve wedging during operation, reduced hydraulic resistance of valve, decreased deformation of valve gate at hydro-impacts and rapid pressure drops of working medium, and increased operation life of valve.

2 dwg

Description

The invention relates to valves, in particular to two-seat valves, and can be used in any industries to control various process parameters associated with liquid and gas-like environments.

A known method of operating pipe fittings (Gurevich DF Calculation and design of pipe fittings, Leningrad, "Mechanical Engineering", 1969, p. 33-35), according to which when the valves are operated, processes occur, as a result of which under the influence of the flow of the working medium (gas-like and liquid substances) change the properties of materials and the dimensions of the valve parts, in particular the valve and its supports. When the influence of such changes becomes so great that further use of the valve is impossible or unsafe, its boundary state occurs, as a result of which it must be replaced or repaired.

Such operation of the valve does not allow the solution of the indicated problems by reducing the degree of one-sided wear of the gate supports as a result of the influence of the working medium flow on the shutter. One-sided wear of the valve supports leads to gaps between the valve and valve seats when it is closed, and also leads to valve valve jamming during operation. In addition, due to the tendency of the shutter to deform from water shocks and sudden changes in the pressure of the working medium, the permissible leak rates are exceeded when it is completely closed. In the presence of temperature deformations, the amount of leakage exceeds the permissible values several times.

A known method of operation of a two-seat valve described in Russian patent No. 2145021 (IPC 7 F16K 1/44, publ. 01/27/2000), in which the shutter is placed in the equalizing pipe located concentrically to the valve axis, with which, in the opening mode of the chamber valve above and below shutters are communicated, as a result of which the pressure difference between the chambers is equalized.

However, this method is aimed at balancing the pressures between the seatposts and can only be effectively applied at high pressures when transporting large volumes of high-temperature fluid. Also, the problem of one-sided wear of the gate supports as a result of the influence of fluid flow on the valve, as well as the problem of jamming of the valve shutter during its operation, is not solved.

Known method for reducing the coefficient of hydraulic resistance to flow of the hull double seat valve (AS CPCP №953332, IPC ³ F16K 27/02, F16K 1/44, publ. 23.08.1982), divided into two to which a double seat valve fluid flow parts in the inter-seat chamber with a rib, the plane of which is parallel to the planes of the saddles. Two flows of the working medium, bypassing the inter-seat chamber, are combined in the outlet pipe without reducing the speed. However, the influence of the fluid flow on the valve plug does not decrease, which also increases the hydraulic resistance of the valve. The shutter supports when exposed to the shutter of the working fluid flow are subject to intense unilateral wear.

The objective of the invention is to increase the reliability and durability of the valve by reducing the influence of the flow of the working medium on the valve shutter, eliminating one-sided wear of the valve shutter supports, eliminating jamming of the valve shutter during its operation, reducing the effect of water hammer and sudden pressure surges that lead to valve deformation.

The problem is solved in that the flow of the working medium after the inlet pipe by the septum is divided into two parts, which are directed in opposite directions to the seatposts, from which the flow of the working medium enters the interstitial chamber, which is divided into two interstitial chambers by another partition, where each of these flows is divided into two flows directed in opposite directions, which act on the shutter in opposite directions, while these flows bend around the partition from the sides and enter t into the outlet pipe.

The technical result is an increase in the reliability of regulating the flow of the working medium, elimination of one-sided wear of the valve shutter supports, elimination of jamming of the valve shutter during its operation, ensuring the preservation of the allowable medium allowance at high pressure drop, reducing the hydraulic resistance of the valve, reducing the deformation of the valve shutter during water hammer and sudden pressure drops working environment, providing a more rigid valve design, increasing valve service life.

Figure 1 shows a General view of the two-seat valve and figure 2 is a section aa in figure 1.

The two-seat valve comprises a housing 1 with an inlet pipe 2 and an outlet pipe 3, coaxially located saddle 4 and saddle 5, seatpost 6 and seatpost 7, shutter 8, seatpost, which is divided into seatpost 9 and seatpost 10, which communicate between themselves and are divided parallel to the plane of the seats 4, 5 by a partition 11, which is installed after the inlet pipe 2 to the shutter 8 and mounted on the inner walls of the housing 1, and a partition 12, which is installed after the shutter 8 in front of the outlet pipe 3.

When the shutter 8 is open, the flow of the working medium enters the inlet pipe 2 and, reaching the septum 11, bypasses it, splitting into two streams, while one stream enters the seat chamber 6, and the other stream enters the seat chamber 7. At the same time, part of the flows from the seatpost chamber 6 and from the seatpost chamber 7 are combined in the seatpost 9, and part of the flows from the seatpost 6 and from the seatpost 7 are combined in the seatpost 10.

From the seat chamber 6, the flow of the working medium passes through the opening of the seat 4, bypassing the shutter 8, and enters the inter-seat chamber bounded by baffles 11 and 12, where, upon encountering the baffle 12, it is divided into two streams, while one stream enters the inter-seat chamber 9, and the other flow enters the interstitial chamber 10. At the same time, from the saddle chamber 7, the flow of the working medium passes through the hole of the saddle 5, bypassing the shutter 8, enters the interstitial chamber, which is limited by partitions 11 and 12, where, upon meeting it installed on it ways to cross town 12, is divided into two streams, while one stream enters the interstitial chamber 9, and the other stream enters the interstitial chamber 10.

Curving from the sides of the partition 12, which is installed on the path of the working medium flows from the inter-seat chambers 9 and 10, the flows are combined in the outlet pipe 3, and then they enter the production line.

Thus, the action on the shutter in opposite directions of the flow of the working medium by separation and directing them in opposite directions before and after the shutter reduces the influence of the working medium on the shutter, while increasing the reliability and durability of the valve, eliminating one-way wear of the valve shutter supports and jamming of the valve shutter during its operation, the influence of water hammer and sharp pressure surges, leading to the deformation of the shutter, is reduced.

The proposed method improves the reliability and durability of the two-seat valves.

Claims (1)

The method of unloading the shutter of a two-seat valve, in which the flow of the working medium in the inter-seat chamber is divided into two parts, characterized in that the flow of the working medium after the inlet nozzle is divided into two parts, which are directed in opposite directions to the seatposts, from which the working fluid flows into the interstitial chamber, which is divided into two interstitial chambers by another partition, where each of these flows is divided into two flows directed in opposite directions, which Procedure for the bolt in the opposite directions, whereby these flows laterally encircle septum and enter the outlet.

Images