CN2816510Y - Cage balancing type single-seat regulation valve - Google Patents

Abstract

The utility model relates to a cage balancing type single-seat regulation valve, particularly a local instrumentation which is used for regulating and controlling a process parameter of the convection current quantity, a pressure process parameter, a temperature process parameter and a level process parameter in an industrial process automated system. The utility model belongs to the technical field of the automatic control technology. The utility model is mainly uses that a valve rod is connected with a valve core; a sleeve barrel assembly which is composed of a balancing ring seat, a balancing ring, an energizing ring and a sleeve barrel is arranged on a valve body; an upper cover flange connects an upper cover with the valve body by a bolt; a filler pad, fillers, a filler pressing cover and a pressing plate are respectively arranged on a valve rod. The utility model has the advantages that the structure is simple, reasonable and compact; the volume is small; the weight is light; rated flow capacity (Cv value) is big; once assembled qualified rate is high; the utility model can bear a high pressure difference grade and a high leak grade under the condition with equal driving sources, and the leakage of a regulating valve is reduced; the dynamic noise of the regulating valve is effectively reduced, and the generating probability of the cavitation damage phenomena and the cavitation phenomena is reduced.

Description

Cage balance type single-seat adjusting valve

Technical field

The utility model relates to a kind of cage balance type single-seat adjusting valve, specifically is used for the field instrument that flow, pressure, temperature and thing position four big procedure parameters are regulated and controlled of industrial process automation system, belongs to the automatic control technology field.

Background technique

Before the utility model is made, in prior art, existing cage balanced control valve of the same type, loam cake adopts the integrated type foundry goods, and the main problem that exists has: single seat is regulated owing to be the single seat sealing, and spool is uneven form, at upstream pressure greatly under the situation greater than downstream pressure, spool can form very big unbalanced force up and down, modulating valve needs very big driving source just can overcome the unbalanced force that is produced by medium, so the single seat type modulating valve is not suitable for the operating mode of High Pressure Difference.The cage balance type is owing to being the two-seater sealed type, and is very high to processing request, thus can not be very high on the leakage grade, can only reach the III level; Though unbalanced force is less, the small dimension modulating valve is said the ratio that the difference of the area of two sealing surfaces accounts for the whole area that bears unbalanced force is still bigger, use occasion still has certain narrow limitation.Owing to adopt the integrated type loam cake, influenced the concentricity of spool and loam cake stuffing box on fastening in the bonnet bolt, spool and valve seat gap are wayward, the leakage class that the technology that many employings are ground in the assembly process is come the regulating and controlling valve, the manufacture cost height, it is low once to assemble up-to-standard rate.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned deficiency, thereby provides a kind of simple, compact and reasonable for structure; Volume is little, and is in light weight, and specified negotiability (Cv value) is big, once assembles the up-to-standard rate height, has under the condition of equal driving source, can bear the cage balance type single-seat adjusting valve of High Pressure Difference and high-leakage grade.

Main solution of the present utility model is achieved in that

The utility model mainly adopts valve rod 1 to connect with spool 14, the balance ring seat connects sleeve 15 11 times, gimbal 12, energization ring 13 are housed between balance ring seat 11 and sleeve 15 successively, form sleeve assembly by balance ring seat 11, gimbal 12, energization ring 13 with sleeve 15, sleeve underlay 16 is installed on the valve body 17 with sleeve assembly, loam cake flange 7 usefulness bolts connect loam cake 6 with valve body 17, Packing seat 5, filler 4, Gland 3 are installed in respectively on the valve rod 1 with pressing plate 2.

Compared with the prior art the utility model has the following advantages:

The utility model is simple, compact and reasonable for structure; Volume is little, and is in light weight,, specified negotiability (Cv value) is big, once assembles the up-to-standard rate height, also has under the condition of equal driving source, can bear the characteristics of High Pressure Difference and high-leakage grade; Because the spool valve seat adopts cage construction, the adjustment curve window is opened on cage sleeve, the single seat sealing is adopted in the sealing of spool and valve seat, under the modulating valve working state, processing medium by the modulating valve upstream through the throttling window of sleeve and spool downstream to modulating valve, under the modulating valve closed condition, because upstream pressure is greatly greater than downstream pressure, the spherical adjustment valve needs very big driving source just can overcome the unbalanced force that is produced by medium, after adopting balanced structure, processing medium by the modulating valve cavity of resorption through the pressure compensation opening of spool epicoele to modulating valve, make spool be under the pressure balance up and down, unbalanced force is the limited part that two sealing surface area difference are produced about the spool, has reduced the ouput force of driving source greatly; Owing to adopt the single valve stand structure, greatly reduce the leakage rate of modulating valve; Simultaneously,, effectively reduced the kinetic noise of modulating valve, also reduced the probability that cavitation erosion and cavitation phenomenon produce owing to adopted the throttling window.

Description of drawings

Fig. 1 is the utility model structural representation.

Embodiment

Embodiment during following the utility model is incited somebody to action in conjunction with the accompanying drawings is further described:

The utility model mainly by fill up 8 on valve rod 1, pressing plate 2, Gland 3, filler 4, Packing seat 5, loam cake 6, loam cake flange 7, the sleeve, parts such as loam cake pad 9, pin 10, balance ring seat 11, gimbal 12, energization ring 13, spool 14, sleeve 15, sleeve underlay 16 and valve body 17 form.Wherein, valve rod 1 is fixed in case spline moving (formation mangetic core assembly) by using pin 10 after the scyewed joint again with spool 14.The balance ring seat connects sleeve 15 11 times, gimbal 12, energization ring 13 is housed successively between balance ring seat 11 and sleeve 15, forms sleeve assembly by balance ring seat 11, gimbal 12, energization ring 13 with sleeve 15.On sleeve 15, be provided with the adjustment curve window.After treating to be installed in sleeve underlay 16 and sleeve assembly on the valve body 17, mangetic core assembly is installed successively again.Fill up 8 on the installing sleeve in balance ring seat 11 upper end slot of sleeve assembly, loam cake pad 9 is installed on the mounting hole end face of valve body 17, and then loam cake 6 is installed.Loam cake flange 7 utilizes bolt that loam cake 6 is connected (but the bolt on the loam cake flange wouldn't be tightened) with valve body 17 then, black box is installed afterwards, black box is made up of with pressing plate 2 Packing seat 5, filler 4, Gland 3, and Packing seat 5, filler 4, Gland 3 are installed in respectively on the valve rod 1 with pressing plate 2.At last, tighten attachment bolt on the loam cake flange 7, and meanwhile note adjusting flexibility and the straight line motion of mangetic core assembly, and guarantee the sealing of loam cake 6 and valve body 17.

The utility model has pneumatic (or electronic) straight journey actuator that accepts 4-20mA (or 0-10mA) standard control signal to drive, driving valve rod and spool makes straight-line displacement and changes captured area between spool and the valve seat, come stably flow, temperature, pressure or the thing position of control media by the adjustment curve on the spool, satisfy on-the-spot requirement.Be mainly used in the higher robot control system(RCS) of automaticities such as iron and steel, petrochemical industry, papermaking, be specially adapted to higher than small pressure difference, degree of regulation, need frequent movement, leakage had the harsh occasion of strict demand.

Claims (3)

1, a kind of cage balance type single-seat adjusting valve, comprise valve rod (1) spool (14), valve body (17), it is characterized in that adopting valve rod (1) to connect with spool (14), connect sleeve (15) under the balance ring seat (11), in between balance ring seat (11) and sleeve (15) gimbal (12) is housed successively, energization ring (13), by balance ring seat (11), gimbal (12), energization ring (13) is formed sleeve assembly with sleeve (15), sleeve underlay (16) is installed on the valve body (17) with sleeve assembly, loam cake flange (7) connects loam cake (6) with bolt with valve body (17), Packing seat (5), filler (4), Gland (3) is installed in respectively on the valve rod (1) with pressing plate (2).

2, cage balance type single-seat adjusting valve according to claim 1 is characterized in that filling up (8) in described balance ring seat (11) upper end slot on the installing sleeve, and loam cake pad (9) is installed on the mounting hole end face of valve body (17).

3, cage balance type single-seat adjusting valve according to claim 1 is characterized in that described sleeve (15) is provided with the adjustment curve window.