What’s the difference between the V-type ball valve and eccentric hemisphere ball valve?

Is the V-type ball valve same with eccentric hemisphere ball valve? That's a lot of V-type ball valve and the V-type ball valve and eccentric hemisphere ball valve, we will detail for you on doubts.
V-type ball valve although both belong to the eccentric half ball valve series, but V-type ball valve is not that eccentric hemisphere ball valve, the difference between them is as follows:
Is the use of eccentric hemisphere ball valve eccentric ball and seat, when the valve stem rotates the self-centering in the common trajectory, the closing process more closed more tight, fully achieve a good sealing purposes. The eccentric hemisphere ball valve ball and seat completely out, eliminating the wear ring to overcome the traditional ball valve seat and the sealing surface of the ball is always the problem of wear seat metal surfaces are well protected. This product is particularly suitable for steel, aluminum, fiber, tiny solid particles, pulp, coal ash, petroleum gas and other media.

Eccentric eccentric hemisphere ball valve working principle: usually double eccentric semi-ball, that the sealing surface and the shaft center of the eccentric center, and eccentric, valve and valve seat and the valve shaft center of the flow-through center bonding surface formed about 3 degrees rotary cutting angle, it is relying on this cutting edge angle of the actuator torque force into self-locking wedge than the pressure seal, eccentric half ball Features:

1)Spherical pinch valve, easy to crystallize stammer was destroyed for crystallization, stuttering and not clean medium situation.
2)The flow path is simple, Kv value is large, good self-cleaning properties.
3)Small size, light weight.
4)Suitable for two-position control. It has a regulatory function, and open fast, lightweight, wear self-compensation, can get rid of scale on their own. For conveying precipitation, scaling, crystallization, containing impurities of two or more media.

V-type ball valves are fixed (diffrent from trunnion ball valve), also single seat seal valve, regulating valve in the best performance,which is equal percentage flow characteristic, adjustable ratio of 100: 1. With a shearing action between its V-notch and metal seat, especially for containing fibers, tiny solid particles, slurry and other media. Applicable to the regular operation, open and close quickly, lightweight, fluid resistance, simple structure, relatively small size, light weight, ease of maintenance, good sealing performance, unrestricted installation direction, the flow of media can be arbitrary, no vibration, noise .

For the V-type ball valve and eccentric hemisphere ball valve,we think eccentric hemisphere ball valve more durable, V-type ball valve adjustment better. The main difference between the V-type ball valve and eccentric hemisphere ball valve that: V-type ball valve is used in with a flow regulation and working conditions in the media as having impurity particles of fluid. Eccentric hemisphere ball valve does not have the flow regulation, but can also be used in fluid conditions have foreign particles.

Should you want to know more about ball valve from Reliable China valve manufacturer, please visit www.reliavalve.com or email us via sales@reliavalve.com.

original:What’s the difference between the V-type ball valve and eccentric hemisphere ball valve?

The pneumatic piston actuator for the V-type ball valve

Features piston actuator for v notch ball valve is the stroke length, but the price is expensive, so only for special occasion needs. It is also divided into two types of spring and without spring. Piston actuator acceptable higher operating pressure, air pressure and can be reached 0.5-0.7MPa, so its large output power.

Piston actuator with a spring itself can achieve a proportional action and the two movements, as compared with no spring piston actuator, can automatically create two forms of normally open and normally closed, and has broken a source of security, and improve in use security and reliability. Structure without a spring piston actuator is relatively simple, because do not have to overcome the spring reaction force, and therefore has a greater output power. It has two action and proportional action in two operation modes, in which the two sides of the piston action by the switching operation of the pressure to achieve, while the proportion of the action when the control signal is changed, on both sides of the piston to establish the necessary pressure difference, when the piston reaches the signal proportional to the stroke, the pressure on both sides by means of a double-acting piston V-ball locators, the piston maintained in a stable position.

Should you want to know more about ball valve from  Reliable China valve manufacturer, please visit www.reliavalve.com or email us via sales@reliavalve.com.

V-type ball valve in the regulation System

Recently, a chemical plant of the user phone call asking, conditioning system in their plant equipment using the original valve seat, no 3.8MPa steam, adjust the system is stable; increase 3.8MPa steam, the steam turbine coupled with the opening stop, original valve cannot meet the requirements, in particular in:

1) V-type ball valve leakage volume, closed lax, resulting in valve in a small opening, poor regulation characteristics.
2) V-type ball valve body vibration, noise is high.
3) V-ball valve fluid flow rate is high, the long-term erosion of the V-type ball valve stem up and down vibration severe, resulting in the stem and the valve plug Disconnect, a direct result of the steam cannot pass valve.

In order to solve the above problems, a technician to the site to view and analyze the process conditions and the characteristics of various types of  V-type ball valve, and finally decided to replace the original V-type ball valve seat, valve seat suited to use in the above case because the channel complex, large flow resistance, a small adjustable range; stem up and down movement of the spool poor stability, vibration. V-type ball valve stroke than a straight valve has great advantages which is composed of V-type ball valve structure decisions, V-type ball valve spool eccentric structure in the structure, in addition to the closed position, the core seat does not touch the remaining positions, reducing the wear and tear, the valve once opened to disengage the seat, reducing the operating torque, while the spool exclusive V-shaped opening may well ensure that the valve regulating performance in a small opening to solve the linear actuator valve in a small opening operating characteristics of a bad problem, V-type ball valve flow path is simple, straight-through single, small flow resistance, large tuning range, flow-open valve pressure recovery coefficient is higher than the valve seat is more applicable to the case of the occurrence of cavitation , V-type spool valve stem movement of rotation and linear movement of the valve compared to overcome the large pressure difference, which is 2.5 to 10 times straight trip valve in solving high temperature problems, V-type ball valve just hard soft elastic sealing solutions combine core seat due to hold at high temperature expansion card problem, while using high temperature resistant filler stem to ensure the reliability of sealing at high temperatures.

After a period of proof, V-type ball valve regulating fast response, wide flow range control, basically no vibration, noise is significantly reduced, eliminating the hazards present in the system.

Should you want to know more about ball valve, such as trunnion ball valve from China valve manufacturer, please visit www.reliavalve.com or send email to sales@reliavalve.com.

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