Double-eccentric metal-to-metal
sealed Butterfly Valve
Summary:
Flange double-eccentric metal-to-metal sealed butterfly valve is
operated by worm gear to decelerate to drive the disc to rotate within 90°.It can be applied to cut off or
regulate the flow of media. The valve can be actuated by operating lever,
handle wheel, electric actuator or pneumatic actuator. Underground valve can be
operated by an extended Spindle. No matter operated by electric actuator or
pneumatic one, positions where the valve is opened and closed are all equipped
with limit switches and indicating devices that synchronically show the opening
state of the disc.
Structure:
Being double eccentric, when opened, the
sealed ring of the disc is automatically off-seated after only a little degree
of opening movement. The sealed ring completely bears no external pressure,
which helps the valve keep longer life.
Butterfly valve has the capability of
bi-directional sealing, which achieves no leakage in both primary and secondary
directions, especially applicable to underground water-supplying network of
pipes with circular multi-sources. If only unidirectional media, when
installing the valve, the primary direction is of priority.
The position of sealed ring can be
adjusted in all directions to modulate the compression of the sealing, which
makes the valve able to be operated by minimum torque.
The base ring of the body and the
sealed ring of the disc all employ stainless steel of excellent quality, which
are competent of high temperature and anti-corrosion and long service life. The
sealed structure of the valve uses divided-body design, dependable interchangeability,
easy to apply and maintain.
As to those valves whose DN is
equal or larger than 1200 mm,
the disc applies the flying-disc design with a result of light weight, high
rigidity, powerful strength, small flow–resistance and Low loss of pressure.
The stem and disc use a
positioning pattern of non-penetration and pin–offset to avoid shearing and
abrasion of the spline caused by frequent shifting of the upper stem and to
prevent abnormal opening and closing of the valve.
Between the stem and the body [o"
ring , a kind of environmentally-protecting rubber is applied, which not only
achieves no maintenance but also reliable sealing, meanwhile, overcomes
potential leakage when stuffing and sealing as well as prevents stuffing`s pollution
of the water.
Technical
characteristics:
Automatic assembly and coating
product line and developed process-flow ensure the outstanding ability of
anti-corrosion and flawless appearances of products.
Anti-corrosion
performance:
Inside and outside surfaces of the
body are coated with electrostatic epoxy resin powder. The coating is even and
firm with good adhesion and excellent anti-corrosion.
Sanitary standard:
Non-toxic epoxy resin powder used
comply with EN sanitary standard.
The
coated resin is in accordance with standards of potable water
Applying area:
The valve can be used in potable
water system, water supply and drainage, heat supply, gas,
metallurgical industry, energy system and pipeline and so on.
Metal Seated Butterfly Valve,Double Flanged Metal Seated Butterfly Valve,Double Eccentric Metal Sealed Butterfly Valve,High Performance Metal Seated Butterfly Valve SUZHOU YUEDA VALVE CO., LTD. , https://www.szyuedavalve.com
Zhang Synthesis: To Understand the Base of Agricultural Resources and Build a Digital Agricultural Management System in the Sky
[ China Agricultural Machinery Industry News ] The main function and spatial layout of agriculture is an important foundation and prerequisite for realizing green development. The State Opinions of the State Council on "Innovation System and Mechanism to Promote Green Development of Agriculture" clearly stated that it is necessary to optimize the functions and spatial layout of agricultural subjects and to construct a scientific and orderly agricultural spatial layout system. In implementing the spirit of the Opinions, we should closely focus on promoting the overall layout of the "five in one" and coordinate the promotion of the "four comprehensive" strategic layout, firmly establish and implement the new development concept, and rationally distinguish the agricultural space, urban space and ecological space. Optimize the regional distribution of agricultural productivity, based on the resource and environmental carrying capacity, adhere to the landscape forest, lake and grass is a community of life, standardize the spatial order of agricultural development, promote the formation of agricultural development pattern that matches the resource and environmental carrying capacity, and the production, living and ecology are coordinated.
Optimize the layout of agricultural space and urban space. Land space is a precious resource and a home for human survival and development. General Secretary Xi Jinping pointed out that everything is long and the meal is big. Under the background of urban and rural development, the development of land and space should not only meet the needs of population growth, improvement of people's livelihood, industrialization and urbanization, but also ensure the national food security and the effective supply of important agricultural products. It is necessary to adhere to a strict system of cultivated land protection, strictly control the expansion of the total area of ​​urban space, control the occupation of cultivated land in various types of construction, and especially protect the basic farmland around the plain and the city, and promote the optimization of urban and rural space and overall development.
Promote the coordinated layout of agricultural space and ecological space. Ecological space is the basis and guarantee for maintaining national ecological security, and protection should be given priority. Agricultural production is a process of natural reproduction, which is compatible with green development. It is necessary to fully understand the important ecological functions of agriculture, actively exert the ecological, landscape and interval functions of agriculture, and greatly enhance the ecological efficiency of agriculture. In agricultural production, it is necessary to tie in the ecological function guarantee baseline for agricultural green development, fully consider the impact on natural ecosystems, and not cause irreversible ecological environment and promote coordinated development of production ecology.
Adhere to the matching of agricultural production and resource and environmental carrying capacity. In accordance with the requirements of natural resources utilization, based on the status quo of water, soil and other resources, and in accordance with the layout of optimized development zones, moderate development zones, and protection development zones, we will guide the development of agricultural development to the advantageous zones and alleviate the pressure of developing agriculture in non-advantageous zones. Prevent and solve structural contradictions in resource mismatch and supply misplacement in spatial layout, and strive to establish a layout of agricultural productivity that reflects market supply and demand and resource scarcity. Strengthen resource and environmental management and control, establish a negative list system for agricultural industry access, formulate a list of prohibited and restricted development industries according to local conditions, and control the scale and intensity of the development of the seed industry.
The landscape of Lintian Lake Grass is a life community concept for agricultural production. The green development of agriculture should respect nature, conform to nature, protect nature, and guide green to the whole process of agricultural development, promote green production methods, and strictly prohibit agricultural development activities such as water surface, wetland, forest land, grassland and other ecological space, and build an idyllic ecosystem. It is necessary to follow the law of ecosystem integrity and biodiversity, base on spatial balance and stability, accelerate the delineation of food production functional zones, important agricultural product production protection zones, identify the dominant areas of characteristic agricultural products, clarify regional production functions, and ensure national food security and important agricultural products. Effective supply.
In actual work, it is necessary to establish an important agricultural resource account system and find out the base of agricultural resources. The construction of the digital agricultural management system in the sky, using space remote sensing, aerial remote sensing, and ground-based IoT integrated observation technology to achieve dynamic monitoring and management of resources and environment, to provide support for the dynamic adjustment of agricultural main functions and spatial layout.