Installation and Commissioning of Regulating Valve

With the progress of science and technology, the production process automation to control the flow of fluid control valve has been widely used in various industries. For thermal, chemical control system, control valve as the ultimate medium of the quality control process and safety indexes, plays an important role in the stable production, optimal control, maintenance and repair cost control. In the application of the control valve, the calculation and selection is the prerequisite, installation and commissioning is the key, use and maintenance is the purpose. If the sanitary check valve is not installed properly, or debugging is not good, it can not play the role of regulation, and even become a system of drag.

Basic principles of installation
The installation of the control valve should comply with the relevant national standards, in strict accordance with the design drawings and design documents. For example, construction and installation engineering quality inspection and evaluation standards, industrial construction and acceptance of automation, electrical equipment installation engineering construction and acceptance specification; comply with relevant provisions of applicable national standards required for the installation of equipment, auxiliary equipment and materials should be the main material.

Regulating valve and accessories from the factory to the installation before, all kinds of impact of random vibration and handling in transit vehicles, and during transportation and storage, environmental temperature and humidity changes, which can result in the performance of control valve and accessories change. Therefore, it is necessary to carry out part of the performance test before installation.

Sanitary regulating valve is installed before the test include the following: appearance, static characteristics, leakage, load the whole journey time, compressive strength, insulation performance, air tightness and sealing and so on, of which the first 5 will check for the project.

Of course, there are some requirements for the inspection site. For example: the requirement of environmental temperature at 10 ~ 35 DEGC; air relative humidity is less than 75%; the venue has sufficient space and adequate lighting or lighting conditions; around the local oscillator can not have sharp and strong magnetic field interference; power supply, gas supply to meet the requirements.

Pneumatic Sanitary Diaphragm Valve

Product overview:
The pneumatic sanitary diaphragm valve is composed of two parts, the sanitary diaphragm valve and the pneumatic actuator. It takes the compressed air as the driving force. Because the structure of the diaphragm and valve body has corrosion resistant lining and corrosion stuffing structure, throttling element for the elastic diaphragm and the valve body flow smoothly, so the pneumatic diaphragm valve has a negative film force, large flow, no leakage, fire and explosion prevention and convenient and reliable advantages, widely used in industrial automation system in strong acid, alkali, strong corrosion, high viscosity, containing grains, fiber and toxic and not allow pollution of medium flow regulation.

Technical parameters:
(1) Connection: clamp or welding;
(2) Specification: 1/2 "-2"
(3) Control mode: pneumatic;
(4) Valve material: 316L;
(5) Diaphragm material: ethylene propylene rubber, ethylene propylene rubber / ethylene propylene diene rubber (EPDM) / EPDM (three) ethylene propylene rubber;
(6) The use of temperature: ethylene propylene rubber, ethylene propylene rubber, 130 degrees C, PTFE / ethylene propylene diene rubber (EPDM);
(7) The use of pressure: ethylene propylene diene rubber 0 ~ 10bar; PTFE / ethylene propylene diene monomer 0 ~ three ~ 10bar.
(8) The utility model has the advantages that: the device is designed with a regulating and limiting device, which reduces the difficulty of the welding of the bottom of the tank and is compact in structure, and is suitable for small space.

(9) Application: typical application in fermentation tank, mixing tank, filling machine, sterile filter, water equipment, PW, WFI transport and distribution, sterile fluid delivery and CIP, SIP, etc.. Pneumatic diaphragm valve is widely used in pharmaceutical, food and beverage, fluid equipment, cosmetics and other industries.

Working principle：
The closing and opening of the sanitary diaphragm valve is realized by the pressure from the pipeline to enhance the rubber diaphragm. When the pressure medium enters the valve control chamber, the diaphragm is pressed down, and the valve passage is closed. When the pressure of the control cavity is discharged to the atmosphere or the downstream pipeline, the diaphragm rises and the valve passage is opened. The valve is not stem, sealing pad, orientation seat, is the only component channel movement of the diaphragm, so there is no rustily, with higher stability. A variety of structural forms, can be applied to a variety of fluid control needs.

Operating Procedures of Pneumatic Ball Valve

When sanitary pneumatic ball valve is closed, the hand wheel is clockwise, the stem began to decline and to leave the seat to rotate a sphere. Continuing to rotate handwheel, stem were embedded in the spiral groove of the guide pin, is about to close, the ball has been no contact with the valve seat under the condition of rotating 90 DEG. Hand rotation of the last few laps, the stem is at the bottom of the angular plane mechanical wedge pressure sphere, so closely pressed on the seat, to be completely sealed.

Overview of sanitary pneumatic ball valve, all through the precision inspection process and strict quality management, the channel after the polishing and sterilization processing, using a full package of 4F seal, no dead ends and easy to clean.

The actuator is connected with the ball valve without support, reduced due to quality problems, caused by the installation and connection, while also saving the space for the factory with the channel wall equipment. By using the PTFE fluid package is not dead, ensure health. No support and integrated with the actuator.

Sanitary regulating valve is facilitated to remote. Easy maintenance, simple ball valve, seals are generally activities, removal of the replacement is more convenient. It can be fully opened or fully closed, the ball and seat sealing surface and the dielectric isolated the medium, will not cause erosion of the valve sealing surface. A few meters from the high vacuum high pressure can be applied. Because the ball is in the opening and closing process of wiping, so it can be used with suspended solid particles of the medium.

How to Select The Right Valve

How to select the valve according to the nature of the valve drive
1 power driven valve
Power driven vacuum valve is commonly used to drive the valve, usually referred to as the form of the drive device for the valve electric device, valve electric device features are as follows:
1) Open and close rapidly, can greatly shorten the time required to open and close the valve;
2) Can greatly reduce the labor intensity of operators, especially for high pressure, large diameter valve;
3) Suitable for mounting in a position that can not be manually operated or difficult to access, easy to implement remote control, and the installation height is not restricted;
4) Is conducive to the automation of the whole system;
5) Power supply is easier to obtain than gas source and liquid source, and the laying and maintenance of the wire is much simpler than that of compressed air and hydraulic pipeline.

2 pneumatic and hydraulic valves
Pneumatic vacuum valve and hydraulic pressure based on a certain air, water or oil as the power source, using the cylinder and the movement of the piston to drive the valve, the general pneumatic air pressure is less than 0.8MPa, the hydraulic pressure is 2.5MPa~25MPa. Sanitary diaphragm valve; rotary gas and liquid driving device is used to drive the ball valve, butterfly valve or cock valve.

The driving force of the hydraulic device is large, which is suitable for driving large diameter valves. If used to drive the plug valve, ball valve and sanitary butterfly valve, the piston must be converted to the reciprocating movement of the rotary surface. In addition to the cylinder or cylinder to drive the piston, there is no use of pneumatic film drive, because of its travel and driving force is small, it is mainly used for regulating valve.

3 manual valve
Manual vacuum valve is the most basic way of driving the valve. The utility model comprises a hand wheel, a handle or a hand plate which are directly driven and driven by a transmission mechanism to realize two kinds. When the starting torque of the valve is larger, the utility model can be driven by a gear or a worm gear to achieve the purpose of omission. Gear reduction ratio is small, suitable for gate valves and globe valves, worm gear reducer is relatively large, suitable for cock flash, ball valve and butterfly valve.

Sanitary three-piece butterfly valve

The sanitary three-piece butterfly valve is simple in structure, small in size, light in weight, small in size, small in size, easy in operation and quick in operation, and has good flow regulating function and closed sealing characteristics. Three-piece butterfly valve is dedicated to dairy products, food, pharmaceutical, beer, cosmetics and other industrial fields.

First, the working principle of sanitary three-piece butterfly valve
Sanitary three-piece butterfly valve is a circular butterfly plate for the opening and closing parts and with the stem to open, close and adjust the fluid channel of a stainless steel valve. The sanitary three-piece butterfly plate is installed in the diametrical direction of the pipe.

Second, the use of sanitary three-piece butterfly valve
Sanitary three-piece butterfly valve is not only simple structure, small size, light weight, the material consumption of the province, the installation of small size, and the driving torque is small, easy to operate, and can also have a good flow adjustment function and close the sealing characteristics. When fully opened, with a small flow resistance, when opened at about ° to 70 °, but also for sensitive flow control, and thus in the field of large diameter adjustment, the movement of the valve plate with a wipe, and thus Can be used for suspension with fixed particles of the media, according to the strength of the seal can also be used for powder and granular media. 

Third, the sealing performance of sanitary three-piece butterfly valve:
Sanitary tri clamp butterfly valve is a neutral stainless steel soft butterfly valve with the sealing principle, the valve plate can ensure that the sealing surface has a suitable surface roughness value, synthetic rubber seat formed a good surface roughness value in the molding process.

Fourth, the features of sanitary three-piece butterfly valve
1, rubber seals and valve plates are imported, to ensure the use of stainless steel butterfly valve performance and use
2, the use of high-precision CNC lathe fine valve body to ensure a reliable stainless steel butterfly interchangeability, eliminating the need to replace the rubber and can not guarantee the use of its troubles.
3, stem set in the nylon sleeve, reducing the friction and thus open flexible and easy. Steel are made of stainless steel, rubber products.
4, opening and closing range of 90 degrees, can be fixed at every 15 degrees position, with adjustable, and open and close quickly, easy to operate.
5, the valve body are removable connection, simple structure, easy maintenance.
6, modeling light and beautiful, the surface of light and no sticky dust, no burr stalker.
7, the sampling carried out not less than 30,000 times the fatigue life test, to ensure its service life.

Fifth, the health level three-piece butterfly valve selection principle
Sanitary three-piece butterfly valve can meet the requirements to achieve a complete seal, gas test leakage is zero, high life requirements, the working temperature is 10 ℃ to 150 ℃，sanitary butterfly valve is widely used in fresh water, sewage, sea water, Natural gas, food, pharmaceuticals, oils and various acid-base and other thin-walled pipelines.

The Introduction of Pneumatic Three-way Ball Valves

Pneumatic three-way ball valve
Product Description:

Pneumatic three-way ball valve uses AT or GT-type pneumatic piston actuator, with huge output power, sensitive action, and the use of direct rotation angle and feedback.

Pneumatic 3 way ball valve can be used in the water supply, petrochemical, metallurgy, mining, textile, energy, paper, food, steel and other piping systems to switch the flow of media and the media shunt or mixed fluid.

First, the use of pneumatic three-way ball valve:
L (T) -shaped pneumatic three-way ball valve is composed of pneumatic actuators and three-way valve. It is a kind of rotary type shut-off regulating valve, which has many advantages such as close tight, compact structure, light weight and easy maintenance. Sanitary ball valves are widely used in gas, liquid, steam, oil and other corrosive media pipeline automation control.

Second, the structural characteristics of pneumatic three-way valve:
1, compact structure, opening and closing quickly, smooth flow, fluid resistance is small.
2, good sealing performance: the use of four-seat valve material PTFE flexible deformation to achieve no leakage seal.
3,multi-purpose: any port can be used as an entrance without leakage, three links can be made of L-port, can also be made T-port.
4, easy maintenance: After the system pressure relief, there is no need to remove the entire valve, the valve body can be checked and repaired.
5, the piston angle travel actuator can be opened and closed quickly with accessories, the valve performance is more perfect.

The features of all-forged duplex stainless steel shutoff valves

The excellent performance of all-forged duplex stainless steel shutoff valve is determined by the performance of the materials and the structural characteristics of the valve itself. So, let's first take a look at the characteristics of duplex steel. The so called "duplex stainless steel" is a kind of steel that the ferrite phase and the austenite phase each accounts for a half in the solid solution. Usually the small amount of phase is no less than 30%. Since there is ferrite phase and austenite phase in the duplex steel, it has a relatively high strength and resistance to chloride stress corrosion associated with ferritic steel, and excellent toughness and welding performance associated with austenitic ones.

The features of all-forged duplex stainless steel shutoff valves:

1. The valve uses overall forging or forged welding structure, passes the non-destructive testing. It undergoes solid solution processing. The composition of the materials is fine. The product appearance is good.

2. The valve sealing is spray-welded hard alloy. Nickel-based solder powder, Stellite alloy, tungsten carbide and other materials can be spray-welded. The hardness can be as high as HRC65. It has excellent wear and corrosion resistance, which improves the service life of the valve.

3. Due to the characteristics of duplex steel material itself, the sanitary valve has a strong resistance to hydrogen sulfide and chloride corrosion.

4. Considering the requirement on the strength of sanitary ball valve stem caused by increased opening and closing torque after the high temperature deposition of water-coal slurry medium, when designing duplex steel ball valve stems, 1740H deposition hardened stainless steel is used. This material can achieve a pretty high strength after deposition hardening process, which meets the real-life requirements of valves.

5. All-forged duplex stainless steel sanitary shutoff valves use fixed-balls. The force on the sealing pairs by the medium is significantly smaller than that of the floating ball, leading to decreased opening and closing torque. The valve seat is designed to be a closed structure, which can effectively prevent the spring failure caused by deposition and fouling. The sealing ring uses flexible graphite or plastic alloy. The material has a very good sealing performance and high temperature-resistant performance.(flexible graphite can be up to 800 degrees Celsius and plastic alloy can reach 3000 degrees Celsius) The valve stem uses deposition hardened stainless steel.

Above are some of the major features of all-forged duplex stainless steel shutoff valves, which have a wide range of applications.