Pneumatic V ball valve VQ647F-16C

Product Features

Quick action, V throttling, configurable locator

Model number

VQ647F-16C

Specification and caliber

DN25-DN300

Pressure level

PN16/PN25

Material

WCB/CF8/CF8M

Product Introduction

VQ647F-16C Pneumatic V Ball Valve

Pneumatic V ball valve VQ647F-16C is used for automatic switching or process control in papermaking, sewage treatment, slurry conveying, and chemical equipment. The selection should check the medium, temperature, maximum and normal flow rates, pressure difference before and after the valve, pipeline standards and control requirements, and should not be based solely on the existing pipe diameter. This article lists the commonly used configuration range, and the final data should be based on project conditions, order confirmation forms, and manufacturing drawings.

Structure and Drive

VQ647F-16C adopts flange connection, V type ball core, and shear flow channel. When the fluid passes through the valve body flow channel, the position of the opening and closing parts is changed by a double acting or single acting pneumatic actuator to complete the cutting or adjustment. The actuator should match the torque or thrust of the valve and reserve a reasonable safety factor. When feedback, positioning, or interlocking is required, the power supply requirements (such as configuration), protection level, and fault safety position of accessories such as gas source pressure, control signals, and solenoid valves or locators should be clearly defined during the ordering stage to avoid interface mismatch on site.

Material and sealing

The commonly used caliber is DN25-DN300, the pressure rating is PN16/PN25, and the valve body material can be selected as WCB/CF8/CF8M. The selection of materials should take into account the corrosiveness of the medium, chloride ions, temperature fluctuations, and cleaning conditions. Enhance PTFE or metal seal, confirm according to particle working conditions, and check its allowable temperature, pressure difference, and leakage level simultaneously. For steam, particle containing, easily crystallized or frequently operated conditions, the hardness of valve internals, packing form and erosion prevention measures should also be confirmed.

Product Specifications

Product Model	VQ647F-16C
Structural form	Flange connection, V type ball core, shear type flow channel
Nominal Diameter	DN25-DN300
pressure rating	PN16/PN25
Valve body material	WCB/CF8/CF8M
sealing form	Enhance PTFE or metal seal, confirm according to particle working conditions
Drive Type	Double acting or single acting pneumatic actuator
Applicable temperature	-20℃ to 250℃, confirm according to the sealing material
Applicable Medium	Pulp, fiber media, pulp and general process fluids

Applicable working conditions

The product features include fast action, V throttling, and adjustable locator. After reasonable configuration, it can be used in papermaking, sewage treatment, slurry transportation, and chemical plants. Dangerous areas should select corresponding actuators, accessories, and wiring methods according to explosion-proof zones; Food, pharmaceutical and other systems also need to confirm the requirements for liquid receiving materials, surface treatment and cleaning. Projects involving oxygen, highly corrosive or toxic media should undergo specialized material and safety reviews.

Installation and Debugging

Before installation, the nameplate, flow direction, and connection standards should be checked, and welding slag and hard debris should be removed to ensure the concentricity of the front and rear pipe sections and avoid the transmission of pipeline stress to the valve body. Reserve maintenance space around the actuator, and protect the cable entrances of electrical accessories such as solenoid valves and limit switches according to the on-site environment; Pneumatic accessories should use a clean and dry air source that meets the requirements of the actuator. The first debugging should check the switch position, stroke feedback, interlocking logic, and sealing condition under low-risk conditions, and then gradually enter the working pressure.

Operation and maintenance

Observe action time, abnormal noise, leakage, valve position feedback, and control signals during operation. When the action is slow, first check the air source, filter pressure reducing valve, solenoid valve or positioner (if configured), limit feedback and pneumatic actuator, and then check the valve stem, valve seat and seals. It is not advisable to blindly increase the driving force. Before maintenance, it is necessary to isolate the medium, relieve pressure, and confirm that there is no residual energy. After replacing the seal, conduct strength, sealing, and action tests according to regulations, and record the material of the spare parts and the date of maintenance.

Q&A on Selection of Pneumatic V Ball Valve

Can VQ647F-16C replace ordinary ball valves for continuous flow regulation?

It is necessary to calculate the flow coefficient based on the minimum, normal, and maximum flow rates and corresponding pressure differentials, and confirm that the V flow channel, valve seat, flow characteristics, and actuator are suitable for adjustment. Simply replacing the actuator of the switch ball valve with a regulating type cannot be considered equivalent in performance.

Do I need to confirm the input signal and valve position feedback when connecting VQ647F-16C to DCS?

It is necessary to confirm the control input, valve position feedback, power or gas source conditions, interfaces, and fault location separately. Input and feedback are not the same function, and it cannot be assumed that all analog signals or communication protocols are fully equipped based solely on the name "regulating type".

VQ647F-16C needs to be turned off after gas interruption. How should the actuator be configured?

The safety position required for the process in case of gas loss should be clarified first, and then the single or double acting scheme, output force or torque, and accessory circuit should be checked. You cannot select cylinders based solely on valve diameter, nor can you assume that all pneumatic configurations will close when there is a loss of air.

Selection and ordering information

Suggest providing requirements for medium composition, design and operating temperature, maximum and normal pressure, flow range, pipeline standards, operating frequency, gas source pressure, control signals, and accessories such as solenoid valves or positioners, as well as requirements for fault safety location and environmental protection. Fouten Flow Control (Jiangsu) Co., Ltd. will verify the caliber, material, seal, actuator, and accessory combination based on this, providing traceable basis for installation and maintenance.

Pneumatic V ball valve special topic can be viewedSelection of Pneumatic Ball ValveThe corresponding electric V structure can be referred toVQ947F-16C electric V ball valveThe overall selection of ball valves can be found inBall valve manufacturer column。