A kind of piston Self-operated flow valve of designs simplification
The utility model relates to a kind of valve, especially Self-operated flow valve.
Original Self-operated flow valve has the function that can realize regime flow, is all because Self-operated flow valve spring is arranged on valve body outside (external spring type), and is all to adopt diaphragm structure; But the defect causing is thus:
1, valve adopts diaphragm structure, and control accuracy is poor, it is aging to be easy to, the life-span is not long.2, due to the limitation of self structure, the spring of valve is external, is connected with regard to many place sealings with built-in spool, has increased the probability of product leakage; And product has brought many inconvenience in processing, packing, transportation, installation, and in transportation process, product is also easily collided with and damages, thereby affects the quality of product.3, valve is bulky, and outward appearance is heavy ugly, and valve own wt is large; Also require the reserved spatial position of on-the-spot installation large, be unfavorable for on-the-spot installation and debugging;
Model utility content
Technical problem to be solved in the utility model, is the deficiency that overcomes above-mentioned background technology, provides a kind of structure small and exquisite, Perfect in shape and function, steady quality, piston Self-operated flow valve easy for installation.
The utility model has adopted following technological scheme:
A piston Self-operated flow valve for designs simplification, comprise be shaped with fluid inlet and fluid output valve body, be arranged in valve body and upper valve base and lower valve base that upper-lower position is corresponding, be vertically positioned in valve body and the valve rod that can move along self axis, be formed on valve rod and the upper valve core that is slidably matched with upper valve base, the lower valve core, the main body spring that forces in lower valve core that are slidably matched with lower valve base, be produced in valve body to provide the honeycomb duct of inlet fluid pressure and be positioned at valve body outside and order about the power mechanism that valve rod and upper valve core move; The bottom that it is characterized in that described main body spring is by the piston holding that can slide up and down, and this piston is connected as a single entity by piston rod and described lower valve core, and described main body spring is set on piston rod and its top forces in described lower valve base; The upper-end surface of described piston is by the opening of lower valve core end face, and communicates with the clearance channel between lower valve core at upper valve base; The lower end surface of piston communicates with fluid inlet by described honeycomb duct.
The top of described main body spring forces in described lower valve base by spring pad.
The top of described piston rod is fixedly connected with lower valve core and piston respectively with bottom.
The top of described Flow valve is connected with valve seal by a flange-type bonnet.
On described Flow valve, also configure two test suites, two test suites are separately positioned on the outside wall portions recess of fluid inlet and the outside wall portions recess of fluid output, and the top of two test suites is all lower than the flange of fluid inlet position flange and the flange of fluid output position flange.
The beneficial effects of the utility model:
1, small product size is little, lightweight:
Because the utility model changes the main body spring that was originally arranged in valve body outside to be built in valve body into, therefore the huge valve mechanism of original volumes is significantly simplified, make the overall dimension of Self-operated flow valve very approaching with common modulating valve size, it is exquisiter, attractive in appearance that product seems, and alleviated the weight of product, improved the reliability of product.
2, easy to use, cost is low, efficiency is high:
Due to of the present utility model simple in structure, manufacture assembly cost low, fairly simple in production assembly process, to have given up after external spring structure, Assembly of the parts all adopts thread connecting mode; Therefore easy installation and removal, is convenient to manufacture and produces maintenance, has also improved working efficiency.
3, can testing valve in front of the door after pressure reduction:
The utility model is except possessing the repertoire of Self-operated flow valve, at fluid inlet end and the fluid outlet of valve, respectively increased again a test suite; Can in valve working process, test easily the front and back pressure reduction of valve, check on-the-spot pipeline state.The mounting point of this test suite is not also vulnerable to collide with, and transportation is safer reliable with installation.
Accompanying drawing explanation
Fig. 1 is main TV structure schematic diagram of the present utility model.
In the piston Self-operated flow valve of the designs simplification that the utility model provides, the both sides of valve body 2 are shaped with respectively fluid inlet 2-1 and fluid output 2-2; Upper valve base 16 and lower valve base 12 are arranged in valve body, and lower valve base is positioned at the below of upper valve base accordingly; Valve rod 18 is vertically positioned in valve body and can be along the upper and lower slippage of self axis, and the top of valve rod was also passed through valve gap 19 and extended to the external world; Upper valve core 17 is installed on valve rod, and when following stem movement and upper valve base be slidably matched; Power mechanism (the straight stroke electric driver of outsourcing normally; In figure, omit) be arranged on the outside of valve body, be connected with valve stem tip and be with ovable valve stem and upper valve core motion; In addition, lower valve core 15 is slidably matched with lower valve base, 10 pairs of lower valve cores of main body spring apply vertical pressure up, honeycomb duct 3 is produced on valve body (fluid inlet one end) for the hydrodynamic pressure at fluid inlet position is provided, and bottom 6 is fixed on valve body bottom by sealing gasket 11 and fixing bolt sealing; Above structure all with existing Flow valve roughly the same.
Improvement of the present utility model is: at described main body layout of spring, in the bottom of body cavity, the bottom of main body spring is by piston 5 holdings, and this piston also slides up and down along valve pocket in valve body; Piston rod 13 vertically arranges, piston is fixed on the bottom of piston rod 13, and described lower valve core is fixed on the top of piston rod, thereby three is connected as a single entity; Described main body spring is set on piston rod, and the top of main body spring forces in described lower valve base (visible in figure: the top of described main body spring forces in described lower valve base by spring pad 4); The upper-end surface of described piston communicates with the clearance channel (being called again valve port) between lower valve core with upper valve base by the opening of lower valve core end face, and lower end surface communicates with fluid inlet by described honeycomb duct; The difference of the hydrodynamic pressure that like this, two end faces up and down of piston bear is the pressure reduction before and after valve.
Further, the valve gap 19 at Flow valve top is made a flange plate type structure, adopts flange plate type valve gap to be connected with valve seal; Not only remarkable simplified structure, and sealing is more effective reliably.
Further again, on described Flow valve, also configure two test suites, two test suites are arranged on respectively first test suite 1 at depression position of the outer wall of fluid inlet, and the second test suite 1-1 at depression position that is arranged on the outer wall of fluid output, and the top of two test suites is all lower than the flange height of fluid inlet position flange and lower than the flange height of fluid output position flange; To be conducive to improve Safety performance, avoid the accident of colliding with.
Working principle of the present utility model is:
The utility model can adapt to by changing the aperture of the lower valve core of Self-operated flow valve the variation of valve front and back pressure reduction, thereby reaches the object of controlling fluid flow.In piston Self-operated flow valve, dispose the throttle element that a local resistance can change, spring in the lower valve core assembly (consisting of compressible spring, piston, piston rod and lower valve core) of variable area of passage is automatically controlled the aperture of lower valve core under the effect of pressure reduction, thereby makes by the fluid flow of valve constant.
When before and after valve, pressure reduction becomes large, the upper and lower pressure reduction of valve piston becomes large, and piston is motion compresses spring up, drives lower valve core to move up, thereby the area of passage of valve port is reduced, and reaches the effect of constant flow; Otherwise pressure reduction reduces, the area of passage of valve port increases.When before and after Self-operated flow valve, pressure reduction is less than minimum startup pressure reduction, spring is not compressed, and the area of passage of valve port is maximum.Compress Spring when pressure reduction is in operating range before and after valve, enters working state, and fluid (for example current) exports by the clearance channel effluent fluid between upper valve base and lower valve core; Because spring drives lower valve core in motion, the size of clearance channel also therefore the circulation area of change-valve body constantly change, in this pressure differential range, water flow keeps constant substantially.When pressure reduction surmounts operating range before and after the Self-operated flow valve, lower valve core reaches the limit of position, and the circulation area of valve body no longer changes, and now lower valve core is just in fixing position, and flow is directly proportional to pressure reduction, with the increase of pressure reduction, increases.