Low temperature ball valve is divided into low temperature floating ball valve and low temperature fixed ball valve, Generally, long neck structure is not adopted. For ball valve with temperature lower than - 50 ℃, neck length shall be determined according to user requirements or calculation; low temperature ball valve is mainly used to output liquid low-temperature medium such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum products and other low-temperature media; the material selection of low-temperature ball valve is very important, and unqualified material will cause external or internal leakage of shell and sealing surface; The comprehensive mechanical properties, strength and steel degree of the parts can not meet the use requirements or even fracture. As a result, liquefied natural gas (LNG) medium leakage causes explosion accident. The main parts of low-temperature ball valve with temperature lower than - 50 ℃ must undergo cryogenic treatment to ensure the low-temperature performance of the valve material up to the standard. In addition, the finish machining size of the parts, especially the surface roughness, should be ensured to prevent the valve from leakage due to deformation caused by temperature change under low temperature condition.

1. The main valve body, auxiliary valve body, gland and other main parts of the product are molded by casting, which has the advantages of light weight and lower cost than forged steel valve.  
2. The long neck structure can effectively solve the neck leakage problem caused by low temperature medium.  
3. Both the upper and lower valve stems are designed with bearing structure, and the torque is lighter in the process of opening and closing.  
4. Automatic pressure relief valve seat design, once the valve body cavity abnormal pressure rise, the valve seat will automatically release to the low pressure end, more safe.  
5. Embedded valve seat sealing ring design, coupled with ball sealing surface grinding, reliable sealing.  
6. The main parts of low-temperature ball valve with temperature lower than - 50 ℃ are treated by cryogenic treatment to ensure the low-temperature performance of valve material up to standard.  
7. Full diameter channel design, small flow resistance and large flow capacity.  
8. Valve rod anti fly out design, safe and reliable, in addition to fire, anti static function.  
9. A variety of drive mode options: manual, worm gear drive, pneumatic, electric, hydraulic, pneumatic linkage, etc.; can also be used with the automatic transportation control. Eccentric hemisphere valve fixed ball valve V-type regulating ball valve floating ball valve special ball valve for coal chemical industry special ball valve high temperature slag locking ball valve thermal insulation ball valve ash discharge ball valve non-standard ball valve

Product Name: low temperature cast steel fixed ball valve
Product series: fixed ball valve series
Nominal diameter: dns2 ~ 24 "
Nominal pressure: pn0.25-16.0mpa, Class 150 ~ 900
Adopted standards: GB, ANSI, DIN, JIS, BS, API, NACE
Working temperature: - 196 ~ 180 ℃

(1) In strict accordance with the requirements of the contract, to provide qualified products that meet the design standards.
(2) Strictly check and control the quality of raw materials, components and accessories.
(3) Ensure that the processing technology of the equipment is perfect and the detection means are complete. Products will never leave the factory with defects.
(4) Be fully responsible for the supply, quality, equipment performance, technical interface, service and other aspects of the subcontractor. The key parts specified in the contract must meet the requirements of relevant qualification and be approved by the demander.
(5) Provide relevant department standards and drawings to the supervision unit according to the contract, provide convenience for the supervision, and inform the demander and the supervision representative of the shutdown parts of the supervision equipment 7 days in advance. The supervision assigned by the demander is to urge us to produce qualified products according to the standards, but it does not reduce all our quality responsibilities.
(6) The quality defects in the process of equipment manufacturing shall be timely reported to the demander and the supervision representative without concealment. If the equipment defect exceeds the standard specified in the contract, the supplier shall replace it unconditionally. In the process of installation and trial operation, if there are quality problems of the equipment, the problems should be dealt with first, and then the responsibilities should be clarified. Everything should be based on the requirements of project progress.
(7) In case of any accident, we will replace and repair the supplied equipment free of charge as soon as possible until the demander is satisfied.
(8) In case of missing parts or missing parts caused by other reasons in the process of unpacking, we are responsible for making up the missing parts for free as soon as possible. We shall be responsible for the quality problems found during the installation and commissioning of the equipment and in the operation of the equipment in the future.
(9) Provide the demander with all technical data and drawings according to the contract on time. Have the obligation to invite the demander to participate in our technical design audit when necessary.
(10) According to the time required by the demander to the site for technical services, guide the demander to install, trial run and trial production according to the requirements of our technical data and drawings.
(11) For the supporting equipment related to the contract equipment purchased by the demander first, we will actively provide the technical conditions and data meeting the equipment interface requirements.
(12) Strictly implement the minutes or agreements of the meeting held by both parties on relevant issues.
(13) According to the provisions of the contract, free business training courses on equipment installation, commissioning, use and maintenance technology shall be held for the demander.
(14) Strengthen pre-sale, in-sales and after-sales services, and implement "24-hour service", "advanced service", "whole process service" and "life-long service" in the whole process of product manufacturing, installation, commissioning and overhaul.
(15) After receiving the quality problem information reflected by the demander, reply within 24 hours or send service personnel to the site as soon as possible, so as to ensure that the user is not satisfied with the quality and the service does not stop.
(16) Free for the product to provide lifelong maintenance, where our factory users, have established a detailed user file, our factory after-sales service. Regular return visit and inspection system are implemented to guide the daily maintenance of users, and timely point out and solve possible faults.
(17) At any time to meet the demander's requirements for spare parts, lifetime to provide users with high-quality and low-cost spare parts.