Cryogenic Valve Critical Technology

Rapid economic growth in the major industrial countries has caused the demand for natural gas to increase quickly, however the supplying of natural gas must be transported from the production fields to cities and countries around the world. LNG has become the popular and economical method to transport natural gas. C-Tech Company cryogenic valves are widely used in LNG, Oxygen, Liquid Nitrogen and other cryogenic applications.

Features of cryogenic valve technology

1. Extended bonnet, raised back seat design

The extended bonnet design moves the valve stem packing farther away from the cold service to prevent freezing and ensure continued valve operation. Such design also makes it easy to insulate the valve to prevent the loss of cold energy. The length of the bonnet extension is designed in accordance with Shell MESC SPE 77/200 & SPE 77/209 and BS 6364 unless otherwise specified. The raised backseat positions was just below the stem packing, so when the stem is fully back seated, it will prevent abnormal pressure increases, that can occur in the cavity of the bonnet extension, from impacting the packing and potentially causing damage.

2. Cryogenic treatment of main pressure-containing components

The main pressure containing components are submerged in liquid nitrogen to stabilize dimensions and eliminate stress caused by metal microstructure changes. On the other hand, we have professional and excellent mechanical design for every pressure contain components which was used for cryogenic application. So we reduced the possibility of microstructure changes at the most extent.

3. Inspection and test

C-Tech Company cryogenic valves can be cryogenic inspected and tested by itself in accordance with BS 6364 to certify sealing performance in cryogenic conditions when requested by customer. All our prototypes have been conducted the leakage test by helium gas at the environment of liquid nitrogen. We make sure the performance of every cryogenic valve from C-Tech Company was meet the design, related standards and the customer requirements.

Fire Safe Design and Test

Fire safe is the standard design of all C-Tech Company ball valves. C-Tech soft seat ball valve fire safe tests were witnessed and certified by TUV’s Register. Our in-house computerized fire test facilities are capable of testing and certifying of C-Tech floating and trunnion mounted ball valves as per API 6FA and API 607.

Fire safe seat sealing for floating ball valves

When non-metal sealing material have decomposed or deteriorated by a plant fire, the upstream line pressure pushes the ball against the metal seat lip, beneath soft seat to shut off the line fluid and minimize internal leakage.

Fire safe seat sealing for trunnion mounted ball valves and gate valves

Leakage from the valve stem area is prevented by double O-ring sealing, packing and fire safe gasket. Leakage through the valve body joint is also blocked by double O-ring sealing and body gasket. After a fire has deteriorated O-rings, gland gasket, body gasket and stem, fire safe packing is the feature that prevents external fluid leakage.

When non-metal materials such as O-ring, seat insert and spacer have decomposed or deteriorated by fire, the edge of the metal seat, preloaded by the seat spring, comes into contact with the ball to shut off the line fluid and minimize internal leakage through the valve bore. Also the fire safe flexible graphite seat packing will be compressed by the seat spring to prevent fluid leakage between the valve body and the seat.

Body and Bonnet Sealing Material is spiral wound gasket which is made from flexible graphite and SS
Stem sealing material is packing flexible graphite
There is fire safe lip design on the seat of soft seal valve, and the metal seal is used after the soft seal failure.

Low Emission Technology

Global concerns for air quality, coupled with dramatic economic growth and resource conservation forces have caused a worldwide effort to protect our environment.

Industrial valves, historically contributed to environmental pollution and resource waist due to fugitive emissions. To minimize pollution and energy waist, C-Tech Company developed fugitive emission technology inherent in the design for all series of C-Tech valves. The fugitive emission technology in C-Tech valves include: fugitive emission packing, controlled stem finishes, straightness and roundness dimensional control, and controlled stuffing box finishes. Optional live load packing is offered to provide gland load retention consistency. C-Tech Company valves fugitive emission packing is designed with tapered and V-shaped rings to compensate for temperature and pressure fluctuations, stress relaxation and low creep. Controlled stem stuffing box finishes and tolerance control results in better sealing performance and reduced leakage through the stuffing box. By virtue of fugitive emission technology, C-Tech can reduce environmental pollution, energy waist and save our customers’ money. The enhanced design features standard in C-Tech valves lower the overall cost of ownership for customers when they purchase and install C-Tech valve products.
C-Tech fugitive emission valves have been certified by TÜV. All the valve tests are in accordance with ISO 15848 and specific customer requirements.

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High Temperature & Pressure Technology

C-Tech high pressure test bench could meet the requirement of 120Mpa Hydraulic Test and 80Mpa Pneumatic Test.

High temperature & pressure power valves are the key piece of equipment used in the power generation industry. As process temperatures increase in the new design generation systems, high alloy valves are required I the main steam, auxiliary steam and water supply systems.
In accordance with the industry standards for power valves like ASME B16.34, Chinese standard, JB/T3595 and Japanese standard E101, C-Tech has successfully developed a full series of power valves including gate, globe and check valves. C-Tech Company has developed over 300 patterns, available sizes range from DN10 to DN600 (1/4″~24″), pressure rating from PN200 to PN320 (1500~3500LB), primary materials WC6, WC9, C12A, F11, F22, F91. These valves are designed to serve the super critical applications.
C-Tech’s high temperature & pressure power valves are designed and manufactured so as to get reliable shutoff and easy operation under a high temperature environment. Optional internal body cavity relief (pressure equalization) provision prevents over-pressure conditions. The specified bolt torque is maintained during the valve assembly by specialized torque limiting equipment to prevent valves from leaking between the valve body and bonnet and get the reliable long-term operation once the valves are put into service.

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Metal Seated Ball Valve Technology

1. Metal seated ball valve scope

Pressure rating: 150LB~4500LB    Temperature Scope: -196~700℃
C-Tech Company has developed a full range of metal seated ball valves to serve the high temperature and other special services. This valve type is the first choice for many end users.

2. Long life ball and seat design

As the sealing surface is with stellite overlay, tungsten coated or with nitride treatment, a higher wear-resistant is obtained with a longer operating life for the conventional ball valves. That feature makes these metal seated ball valves used widely in demanding services such as high temperature service, fluids with severe abrasion, slurry or solid granules and other severe duties.

3. High precision ball and perfect sealing performance seat

The demanding sealing service is the weakness of a metal seat ball valve design, however C-Tech’s metal seated ball valves have a higher sealing performance. For most of our metal seated ball valves, we can meet the Leakage Class VI as per the standard ANSI/FCI 70-2. Disc Spring energized metal seat sealing design can ensure the sealing reliability under low line pressure while piston effect seat design to ensure perfect sealing under high pressure service. Advanced seat structure and high precision ball preparation ensures the sealing performance and gets the operation torque reduced.

4. Fire safe and Anti-static device

Metal seated ball valves are inherently fire safe and its design is anti-static by nature.

5. Economical material option

For C-Tech metal seated ball valves, sealing material can be chosen for different service conditions so that we can offer the most cost-effective products to our customers.

6. Optional operator

C-Tech Company metal sealed ball valves can be equipped with different operating devices such as gearbox, actuators relying on the valve size, service conditions and customer special request.

7. Laser Cladding Coating which was used for CASC

Triple Offset Butterfly Valve Technology

Size：2~56 ”     Pressure rating: 150~2500LB     Temperature range: -196~700℃
End connection: Double flange, Wafer type, Lug type
Body material: WCB, LCB, CF8, CF8M, CF3M, WC6, WC9, Duplex, H.C276 etc.
C-Tech Company triple offset butterfly valve have two kinds of metal seated design. One the full metal disc, the other is multilayer disc. Duo to the cam effect, the disc does not contact the seat sealing surface during opening and closing process of the valve which ensures a friction free. So, our butterfly valves have a lower operating torque and longer operating life than conventional centric or double offset butterfly valves. The seat consists of multilayer seal rings, when the disc compresses the seal, a tight shut off would be obtained via the seat flexibility. C-Tech company butterfly valve are designed in accordance with API 609 featuring a blow-out proof stem with a visible position indicator.

Quality is of vital importance for C-Tech, and it always non-negotiable. We keep the most effect quality operation system. C-Tech quality management system always focus on the Official 3rd Party verification and the Customer Satisfaction. Many years later, we get the certificates from API, CE, TUV, DNV and China Official 3rd Party Institutions. C-Tech quality system is keeping the continuous improvement to customer requirements.

Most of our team members are from the famous multinationals and sate-owned enterprise. And we build our own R & D Center. Some of our experts are also responsible for some international valve and actuator standards prepare and modification. On the other hand, we also keep the long term cooperation with some of local famous universities, such as Shanghai Jiao Tong University, Shanghai Science & Technology University and so on.

After-Sales Service

C-Tech Company offers all services to create customers more value. Timely, excellent and professional after-sales service is what we promised and provided. You can receive complete sets of services for the projects in time such as technical documents, drawings, product manuals, production schedules, production/inspection control plan etc. You can also get professional services from technically professional personnel including quality follow-up of sold products, site unpacking & inspection, installation guide, debugging and technical training.

Service capability
C-Tech Company owns a competent and powerful team for valve maintenance & consultation, well equipped and high positioned. Complete quality system, effective operation and good teamwork and professional services, which include:
Operation-guarantee
· Evaluating influence of installation pipeline technique & construction results to valves before start-up.
· Identifying valve status after installation
· Evaluating influence of sweeping results in pipeline to valve seal
· Participating in operation system debugging before start-up

Trouble analysis and clearing
· Systematically analysis potential causes to valve failure
· Comprehensively determining risk assessment during trouble clearing of faulty valves

Maintenance
· Accessories, equipment and maintenance proposals
· On-line or off-line maintenance
· Customized maintenance proposals
· On-line maintenance or guide for full welded ball valves and main pipeline valves of oil & gas Pipelines
· Periodic accuracy calibration and maintenance proposal for special control valves
· Long term record links and periodic follow-up system for valves which are maintained on site.

Site technical service
· Consultation service on valve and pipeline operation related techniques
· Valve model selection suggestions and professional design alternatives
· Assessment on influence of pipeline technology and media to valves
· Providing professional equipment to help remove factors that influence valve operation

Training on product use & maintenance
· Professional training courseware
· Trouble shooting exercise
· Customized maintenance proposals

Spare parts
If you need valve spare parts, please contact us and bring the following information meantime:
· Your PO number / C-Tech valve Reference number/Valve TAG number.
· Valve specifications including size, rating class, material.
Feedback
You are welcome to give us your suggestions to improve C-Tech’s products and services. Proposals will be sent to you within 24 hours. If you need site service and support, our professional technical service personnel will arrive at the site to help and stay until everything is OK.

Terms and Conditions

Generally, C-Tech Company warrants its valves to the original purchaser for a period of 18 months from and after the date of delivery to the original customer, against defects in material and workmanship under proper and normal use and service and not caused of improper application or usage, improper installations, improper maintenance and repairs, modifications or alterations.
NO OTHER WARRANTIES, WRITTEN OR ORAL, EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE AND MERCHANTABILITY, ARE MADE OR AUTHORIZED. NO AFFIRMATION OF ACT, PROMISE, DESCRIPTION OF PRODUCT OR USE OR SAMPLE OR MODEL SHALL CREATE ANY WARRANTY FROM MANUFACTURER, UNLESS SIGNED BY THE PRESIDENT OF MANUFACTURER.

CANCELLATIONS:
• Cancelled orders will be subject to a charge of at least 35%.
• Cancelled custom orders will be subject to a charge of 100% of quoted price.
SPECIAL DOCUMENTATION:
A charge will apply for non-standard, special documentation requests such as Material Test Reports (MTR’s) and Certificates of Conformance and official 3rd party institutions.