Pneumatic thin film low-temperature regulating valve/ZMAP-16D

We are a professional manufacturer of Pneumatic Thin Film Low Temperature Regulating Valve/ZMAP-16D. Our independently developed and produced regulating valve has reliable quality, reasonable price, and complete after-sales service. Pneumatic thin film low-temperature regulating valve/ZMAP-16D is suitable for various light and heavy industries and building pipelines. Nen En quality, shared globally! Regulating valves are widely used in various fields such as chemical, petrochemical, petroleum, papermaking, mining, electricity, liquefied gas, food, pharmaceuticals, water supply and drainage, municipal, mechanical equipment supporting, electronic industry, urban construction, etc.

【control valve】Valve body type selection: There are many types of valve bodies for regulating valves, and commonly used valve body types include ① straight through single seat ② straight through double seat ③ angular ④ diaphragm ⑤ small flow ⑥ three-way ⑦ eccentric rotation ⑧ butterfly ⑨ sleeve type ⑩ spherical, etc. When selecting a regulating valve, the following considerations can be made: (1) Valve core shape and structure: mainly based on the selected flow characteristics and unbalanced forces. (2) Wear resistance: When the fluid medium is a suspension containing high concentrations of abrasive particles, the internal material of the valve should be hard. (3) Corrosion resistance: Due to the corrosive nature of the medium, it is advisable to choose valves with simple structures. (4) Temperature and pressure of the medium: When the temperature and pressure of the medium are high and vary greatly, valves with valve cores and seats that are less affected by temperature and pressure changes should be selected. When the temperature is ≥ 250 ℃, a radiator should be added. (5) Prevent flash evaporation and cavitation: Flash evaporation and cavitation only occur in liquid media. In the actual production process, flash evaporation and cavitation can cause vibration and noise, shortening the service life of valves. Therefore, when selecting valves, precautions should be taken to prevent flash evaporation and cavitation.

Overview of Pneumatic Thin Film Low Temperature Regulating Valve:

Pneumatic thin film low-temperature regulating valve is a modified product of single and double seat regulating valves. It differs from the ambient temperature regulating valve in that it uses a long necked upper valve cover to keep the packing working at room temperature. Suitable for regulating media (such as liquid oxygen, liquid nitrogen, etc.) at low temperatures ranging from -60 to -250 ℃. To ensure adjustment accuracy, a valve positioner must be used.

【1】 Structural principle:

The pneumatic low-temperature regulating valve consists of two parts: a pneumatic diaphragm actuator and low-temperature resistant single and double seat valves. The signal pressure from the regulator is input into the air chamber of the pneumatic diaphragm actuator, generating thrust. The valve core is driven by the connecting rod, and the change in the position of the valve core changes the flow cross-sectional area of the valve, achieving the regulation of the medium flow rate.

【2】 Main technical indicators:

【3】 Precautions for installation and use of pneumatic thin film low-temperature regulating valve:

(1) It should be installed vertically on a horizontal pipeline. In special cases where horizontal or inclined installation is required, support should generally be added. The circular board installed on the insulation box wall should be parallel to the insulation box wall.
(2) It should be installed near the ground or floor for maintenance and repair purposes. For those equipped with valve positioners or handwheel mechanisms, it is even more important to ensure easy observation, adjustment, and operation.
(3) Generally, a bypass pipeline is set up to switch to manual operation in case of automatic control system failure or maintenance of regulating valves, so as not to stop production.
(4) When equipped with a handwheel mechanism, manual operation of the bypass pipeline can also be omitted, and it can also be used to limit the opening of the valve. When stopped, the handwheel mechanism must be restored to its original neutral position to facilitate the normal operation of the self-control system.
(5) During installation, the flow direction of the medium should be consistent with the direction indicated on the valve body.
(6) Before installing the regulating valve, the pipeline should be cleaned of dirt and welding slag. After installation, fully open the regulating valve, clean the pipelines, valves, etc., and test the sealing of each connection.

【4】 Main connection dimensions of pneumatic thin film low-temperature regulating valve:

【control valve】It consists of an electric or pneumatic actuator and a regulating valve. Regulating valves are divided into electric regulating valves, pneumatic regulating valves, and hydraulic regulating valves (self operated regulating valves). Regulating valves are used to regulate the flow rate, pressure, and liquid level of the medium. According to the signal from the regulating position, the opening of the valve is automatically controlled to achieve the regulation of medium flow rate, pressure, and liquid level. Regulating valves are usually divided into two types: straight through single seat regulating valves and straight through double seat regulating valves. The latter has the characteristics of large flow capacity, small imbalance, and stable operation, so it is usually particularly suitable for situations with high flow rate, high pressure drop, and low leakage. The flow capacity Cv is one of the main parameters for selecting a regulating valve. The definition of the flow capacity of a regulating valve is: when the regulating valve is fully opened, the pressure difference between the two ends of the valve is 0.1MPa, and the fluid density is 1g/cm3, the flow rate per hour of the regulating valve is called the flow capacity, also known as the flow coefficient, expressed in Cv, with the unit of t/h. The Cv value of the liquid is calculated according to the following formula.

Quanli Ordering Notice: (National Standard)
1、 A: Product name, model, nominal diameter B: Medium and temperature, pressure range C: Are there any accessories, delivery time, special requirements, etc. for us to correctly select for you.
2、 If the valve model of our company has already been selected by the design unit, please place an order directly with our sales center based on the valve parameters.
3、 When the situation you are using is very important or the environment is complex, please provide design drawings and detailed parameters, and our engineers and experts will focus on reviewing and analyzing for you. We can provide you with professional solutions, including design, customization, complete sets, operation, and service. We have always been committed to being a leader in the valve industry, providing you with the latest valve knowledge, the best service, and the best technical consultants. Thank you for visiting our website【www.quanlivalve.com】If you have any questions, you can call us and we will do our best to provide you with high-quality service. Our factory specializes in providingball valve、butterfly valve、gate valve、globe valve、check valve、pressure reducing valve、safety valve、Marine valves、Oilfield valves、Water control valveWaiting for various types of valves.