High pressure differential electric slide valve application introduction

The process industry widely exists in the adjustment of high pressure difference medium, due to the large pressure difference, the force on the valve core is large, easy to cause the valve control instability, serious erosion damage to the valve internals, loud noise and other problems, the conventional solution is to use sleeve valve, labyrinth control valve, multistage pressure relief control valve for control, but this kind of control valve is generally more complex structure, high production cost, And it’s big and bulky. The source crown company’s patented product electric sliding valve can help customers solve the problem of high pressure difference control.
Why can the slide valve solve the problem of high pressure difference? Also need from its structural characteristics

The throttling part of the slide valve is composed of two slide plates, and a number of throttling slots are designed on the slide, and the flow rate of the medium is accurately adjusted by controlling the change of the position of the throttling slot. As can be seen from the comparison diagram of the unbalance force between the slide valve and the single-seat valve, the single-seat valve needs to overcome the unbalanced force of the fluid acting on the spool in order to operate normally, and the slide valve only needs to overcome the friction between the two slides to operate normally, under the same working condition, the unbalance force of the slide valve is only 1/10 of the single-seat valve. Therefore, under the same high pressure difference working condition, if the single-seat valve needs to be configured with 10KN electric actuator to overcome this pressure difference, the slide valve only needs to be configured with 1KN electric actuator.

Electric slide valve has the following advantages in the use of high pressure differential conditions:

Advantage 1: Compact structure, save energy, save installation space
In the case of the same diameter and the same fluid pressure difference, the unbalanced force is only 1/10 of the single-seat valve, greatly reducing the required actuator output force, so the overall structure of the valve is compact, saving energy, saving installation space and cost.
Advantage two: small opening operation, stable control
When the pressure difference of the fluid medium is large and the control valve is operated with a small opening, the pressure difference is more obvious, resulting in unstable valve control, shaking phenomenon, and continuous impact of the valve core and seat, which makes the control extremely unstable. Long-term use will increase the leakage of the control valve, resulting in more unstable control. Because of the small unbalance force, the slide valve can be controlled normally and stably at small opening.
Advantage three: Eliminate the cavitation phenomenon of high pressure differential liquid medium, long service life of the valve
High pressure differential liquid medium is prone to cavitation, resulting in serious noise, vibration and damage to the valve interior material, which directly affects the service life of the control valve. The slide valve adopts a multistage throttling structure of the slide assembly, so that the rupture of the bubble occurs in the downstream pipeline center of the valve body, avoiding direct damage to the valve body and the pipeline.
Advantage 4: The valve interior is washed small, and the leakage is guaranteed for a long time
The high pressure differential media flow rate is large, the erosion damage to the sealing surface of the control valve is serious, the sealing performance is difficult to be guaranteed for a long time, and the increase of leakage leads to unstable control. The sliding valve adopts a face to face hard sealing structure, the sealing surface is hardened, and the sealing performance can be guaranteed for a long time.
Advantage 5: Reduce noise
The medium flows through a number of throttling grooves, the flow state of the fluid is relatively stable, reduce turbulence, and reduce the noise when the fluid flows through the valve body. A large number of experimental results and user experience show that: for high-pressure steam and various gases, the noise can be effectively reduced by 15 decibels.
The following is a brief introduction through the practical application cases of high pressure difference of two electric slide valves.

Regulation and cut-off of high pressure differential steam medium
The regulating valve originally used had problems of scour damage under high pressure difference conditions, inaccurate control and large leakage. The medium was steam, the temperature was 271℃, the pipe diameter was DN125, the pressure before the valve was 5.5Mpa(G), and the pressure after the valve was 0Mpa(G). I have purchased a variety of regulating valve products to try to solve the problem, but they could not meet the requirements. After use, the erosion is serious, and basically about 3 months will need to replace the new valve.
Our company according to this working condition, through selection and calculation, choose V8030 electric slide valve, DN125,PN100, configure 16KN electric actuator can overcome 63 kg of pressure difference, skateboard components spray Stelli alloy hardening, erosion resistance, after one year of field use, the valve body and slide open for inspection, skateboard sealing surface basically no damage. The leakage amount is also the same as when it was just used, which solves the user’s application problems.

Carbon dioxide extraction equipment high pressure difference, small flow regulation
A carbon dioxide extraction test equipment, the medium is liquid carbon dioxide, the maximum pressure difference of 12MPa, need to test 5 groups of pressure corresponding to different flows, need the valve adjustable ratio is large, the best control valve can accurately adjust the 5 groups of working conditions, the customer understands the advantages of our slide type control valve contact our company for selection. Our calculation found that this condition not only the pressure difference is large, the adjustable ratio is large, and the flow is relatively small, the conventional regulating valve can not be used to achieve full control, and our electric slide valve due to the adjustable ratio is large, there are multiple optional CV values under each caliber, one can achieve full control.
After selection calculation, the electric slide valve with DN15,CV:2.0, and equal percentage flow characteristics is finally selected. The actuator thrust is 2KN, and the opening range is 5%~70%, which not only controls accurately and statically, but also saves purchasing cost for customers. In addition, according to customer requirements, we can provide a variety of connection methods such as sandwich, flange, thread, sleeve connection to meet the different needs of customers.
If there are problems with the use of control valves caused by high pressure difference conditions on the site, users are welcome to contact our company to obtain more technical information about slide type control valves in high pressure difference conditions!

Slide valve is more and more recognized by users, and the use of user feedback is focused on small size, accurate and stable control, no leakage, maintenance-free, etc., which reduces the installation and maintenance work of field personnel and various expenditures.

Technical parameters of large diameter slide plate control valve
Diameter: DN300~DN800
Pressure: PN16~40, Class150~300
Body material: stainless steel (CF8, CF8M, CF3, CF3M, duplex stainless steel),
Hastelloy, titanium alloy, Monel alloy, nickel alloy, etc
Medium temperature: -253℃~+816℃
Actuator: pneumatic actuator, electric actuator

The technical parameters of the micro-flow slide plate control valve
Nominal diameter: DN6~DN15
Nominal pressure: PN16~400, CLASS150~2500
Medium temperature: -253℃~+816℃
Body material: stainless steel, all kinds of alloy
Leakage grade: ANSI CLASS IV&V
Flow coefficient Cv: 1×10-6~0.01
Connection mode: thread, sleeve, welding, flange
Driving mode: pneumatic, electric