Changeover Valve is a patented product independently developed by our company, this valve is used in conjunction with a safety valve to
achieve online switching of safety valves. It is especially suitable for systems with backpressure at the safety valve outlet, allowing the safety valve to be safely dismantled for maintenance.
The Changeover Valve is an independently developed product by our company, drawing on similar overseas product designs and adapting them to domestic service conditions (Patent No.: ZL 2011 2 0434286.6). This valve is used together with a safety valve to enable online switching of safety valves.
The Changeover Valve Lockable Combination is another new product independently developed by our company, also based on similar overseas product designs and domestic service conditions (Patent No.: ZL 2015 2 0719490.0). This device comprises a Changeover Valve on the inlet side, a Changeover Valve on the outlet side, and two identical safety valves installed in the middle. A reducing joint can be provided if necessary to facilitate connection transitions. As an upgraded version of the safety valve fast-switching device, it employs a universal coupling and worm gear mechanism to synchronize the actions of both Changeover Valves. This synchronization enables simultaneous interception at the inlet and outlet of any safety valve, allowing online switching between the in-service safety valve and the standby safety valve. It is particularly suitable for systems with backpressure at the safety valve outlet, ensuring the safety of dismantling a valve requiring maintenance.
We engineer state-of-the-art safety valves to protect your systems from hazardous overpressure conditions and maintain continuous productivity. Whether you operate industrial pipelines, petrochemical facilities, or power generation plants, our advanced designs and premium materials deliver dependable performance-even in the toughest environments. Built with a keen focus on quality, safety, and compliance, our valves minimize downtime, reduce maintenance expenses, and safeguard valuable equipment from pressure spikes. Contact us today for a free quote, or to learn more about our comprehensive valve solutions.
Please include as much info as possible regarding your project needs while filling out the form, as this will help our engineers give you a timely response and a more accurate quotation.
Some useful information to include during this phase are:
There’s no harm in not having all the relevant documents or specifications on hand during this phase, however, as our engineers will ask you to provide them when deemed necessary throughout the process.
After contacting us, we will assign an engineer to inquire about your project needs and to calculate project specific technical data, this process will usually take a few days to a week, and can be performed quicker if more information regarding the project is included during the previous initial contact phase.
The information our engineers will require is listed below, they’re the same information mentioned in the previous step:
If there are any changes or amendments to the data you’ve provide, please promptly contact us via email so we can provide timely adjustments.
Depending on the amount of previously supplied information and project details, the drawings may take a few weeks to prepare. If during this time you wish to make adjustments or changes to any project parameters, please promptly contact us directly so we can include them in the drawings.
We’ve included a general timeline for reference below:
| Stage | Typical Duration |
|---|---|
| Data Collection & Review | 3–5 days |
| Conceptual Design | 5–10 days |
| Detailed Engineering | 10–15 days |
| Client Review & Revisions | 7–14 days |
| Final Approval & Delivery | 3–7 days |
| Total | 28–51 days |
Please bear in mind that if you wish to make any changes during this phase, they will take longer to be implemented. For a smooth, expedited process we highly encourage you to convey to us any changes you wish to make as early on in the workflow as possible.
The price quotation can be provided after the necessary calculations have been finished and the drawings rendered. The items included in the quotation are listed below for reference.
If you wish to inquire about any of these items during the quotation process, or wish to make adjustments, please contact us directly via email and we will schedule a online meeting to discuss any questions.
After you’ve agreed to the quotation terms, please sign the quotation documents and scan a copy to us for archiving.
The signage shows that you have agreed to the terms presented on the quotation, so please go over all the items on the quotation thoroughly before making a signature, after we have received your signed copy of the quotation we won’t be able to make any adjustments to it.
As per industry standard, we require that the customer pay a certain percentage of the total cost up-front in the form of an advanced payment, the details of which are delineated during the quotation phase. We will contact you and provide the payment details once this step has commenced.
Please note that at this phase it would extremely time consuming to renegotiate anything related to the advance payment amount or anything related to the quotation.
After the advanced payment has been processed and well-received, we will proceed to the following workflow steps and provide you with our ITP.
We will provide you with our ITP shortly after our advance payment has been received, it will include the following items along with others:
If you have any questions regarding our ITP, please reach out to us directly so we can schedule a meeting.
The production process timetable will vary largely from one another, this is due to the different specifications and the timetables of their own projects. We have provided a standard timetable below for reference.
| Stage | Duration |
|---|---|
| Pre-Production Preparation | 1–2 weeks |
| Component Manufacturing | 3–4 weeks |
| Assembly & Testing | 2–3 weeks |
| Certification & Docs | 1–2 weeks |
| Packaging & Shipping | 1 week |
| Total | 8–12 weeks |
We will keep our customers updated regularly during the production process, and if necessary we have the production capacity and facilities to expedite any orders if requested. As always, customers can contact us directly via email and inquire about the current production timetable, and if necessary a meeting can be organized to better communicate any requests.
This step of the workflow will largely fall on the end-user or an TPI, as such we cannot give a estimated timetable for this step.
However, to streamline the process, we are able to prepare the following documents in advance and share them digitally or in hard copy:
Inspection and Test Plan (ITP):
Outlines all inspection stages, test methods (e.g., NDT, hydrostatic), and acceptance criteria.
Specifies which tests require client/TPI witnessing.
Approved Drawings:
General Arrangement (GA) Drawings: Overall dimensions, nozzle sizes, flange ratings.
Fabrication Drawings: Machining tolerances, weld details, surface finishes.
Certified Drawings: Stamped by regulatory bodies (e.g., ASME, CRN).
Material Certificates (MTRs):
Mill Test Reports for raw materials (body, trim, seals) confirming chemical composition, mechanical properties, and heat treatment.
Traceability to material heat numbers.
Compliance Declarations:
CE Declaration of Conformity (for EU PED compliance).
ASME Sect. VIII Form U1/U1A (for US compliance).
Test Procedures:
Hydrostatic test procedure (pressure, duration, acceptance criteria).
Set pressure adjustment method (spring calibration).
Seat leakage test per API 527 or ISO 4126.
Test Reports:
Hydrostatic Test Report: Pressure held, duration, inspector sign-off.
Set Pressure Test Report: Actual pop pressure vs. specified set pressure.
Seat Leakage Test Report: Measured leakage rate (e.g., bubbles per minute).
Functional Test Report: Simulated overpressure performance.
Non-Destructive Examination (NDE) Reports:
Liquid Penetrant Testing (PT) or Magnetic Particle Testing (MT) for weld integrity.
Ultrasonic Testing (UT) for critical thickness measurements.
Final Inspection Checklist:
Signed by the supplier, client, and TPI to confirm all tests are complete and compliant.
Certification Packages:
ASME Data Reports (Form U1/U1A).
ATEX Certificates (for explosive environments).
As-Built Drawings:
Updated to reflect any deviations from original designs.
Packaging & Shipping Documentation:
Packing list with PSV serial numbers.
Certificate of Origin (COO) for customs.
After the customer approves the shipment quality either themselves or via TPI, they will be instructed to pay the remaining portion of the payment, as previously mentioned.
The payment percentage here isn’t fixed, and is determined during the initial quotation phase.
Shipment will be arranged after all previous payment phases have been finished, however please note that depending on the circumstances some shipment terms (eg. FOB, FCA) may not be applicable. For instance, if the customer has designated a third party to pick up the shipment from our warehouse and then to load the goods, we would be unable to specify this as FOB since we were not involved in the onboarding process. To avoid any of these shipment terms conflicting, please specify your delivery needs and other specifications during the initial quotation phase.
If FOB is utilized, we will provide the following documents:
Commercial Invoice
Packing List
Bill of Lading (B/L)
Export License/Permits
Certificate of Origin (COO)
Dock Receipt/Mate’s Receipt
Pre-Shipment Inspection Report (if required)
If FCA is utilized, we will provide the following documents:
Commercial Invoice
Packing List
Transport Document
CMR Consignment Note
Air Waybill
Rail Consignment Note
Export License/Permits
Certificate of Origin
Forwarder’s Cargo Receipt (FCR)
If you have any issues, please don’t hesitate to contact us directly via email or phone. We would appreciate if you would include relevant information so that we could ID your project more easily, such as project name or including any relevant project files in the attachments. Typically, we will respond to your request in 1-2 days.
On the occasion that a technician will be required on site to fix an issue, we will send an experienced engineer directly from our headquarters to your designated location, and they will remain on-site until the issue is resolved.
With over 40 years of experience in safety value design and production, our products have been used worldwide in various fields, such as in petrochemicals, oil, gas, and chemical plants. Our strict raw material criteria and QA process ensures our valves are of the highest quality, and a rigorous testing process ensures that every product lives up to the standards of our customers, no matter the condition or field.
Our expert team of engineers will provide you with accurate calculations to meet your specific needs, and our after-sales team will follow through with any issue you may have post installation within a date range of 18 months. Contact us today for a free quote, or to learn more about or comprehensive valve solutions.
With over four decades of manufacturing experience, we’ve gradually developed our own intrinsic safety valve production line over the years. Situated in one of China’s oldest industrial cities of Wenzhou, our two manufacturing plants grants us the ability to design, test and manufacture our products all in-house, greatly reducing product cost, while increasing speed and efficiency, ensuring our customer’s requirements are met in a timely manner.
Our network of technical sales engineers and customer service representatives allows us to communicate seamlessly with international customers, whether from producing initial drawings and schematics to the final installation process, our expert team of engineers will accompany our customers until all of their needs are met.
We take great pride in our designs and manufacturing quality, and the many approval certifications we’ve garnered reflects that. We’ve obtained the American ASME-UV, European CE-PED, German ATEX, and the Russian EAC to name a notable few. All of our products are built to meet these standards on a regular basis, ensuring that they’re ready to be used without the need of further modifications.
An experienced, senior team of our in-house engineers will provide you with accurate and timely sizing calculations based your specific needs, using our decades of experience to find any inconsistencies and ensure that the calculations are precise before proceeding to the next phase.
The wide-spread use of our products across the globe has necessitated the use of documentation in other languages, mainly Chinese, English and Russian. If necessary, the documents can also be translated to other languages at the request of the customer.
With many international contracts, our customers span the world over, steadily growing our global presence in the industry. Alongside major domestic Chinese brands like Sinopec and CNPC, our products have also seen application by major Western corporations such as the Exxon Mobil Corporation, Shell, and Air Products, alongside major European companies such as SIBUR, and middle eastern ones like SABIC.
Our ASME UV certification was obtained in 2013, and our test facilities boasts a wide arrange of equipment to ensure or products maintain a high standard. The lab is equipped with an all-function test device, whose maximum caliber can reach DN200 / 8 “, with a maximum pressure of 10MPa/600Lb. Equipment to test incoming raw material is also present at the lab, such as a magnetic particle tester, optical spectrum analyzer, and X-ray tester among others. The combination of both strict in-bound quality and out-bound product testing ensures that our products meet the needs of our customers.
We have a wide product range to meet the needs of customers, all designed in-house and patented. Whether it’s for supplying the chemical industry, pet rochemical, general industrial, or pharmaceuticals, our product range is sufficient to meet industry standards and customer’s needs.
From first ascertaining the necessary measurements and specifications, to choosing the best valve type and drawing up the blueprints for the design, we are committed to following our customers-whether they’re EPC contractors or the end users themselves-every step of the way. Our dedication to our craft also extends to after-sales support and offering on-site services whenever necessary, ensuring that every order is fulfilled smoothly until the end.
Address: Dong’ou Industrial Zone, Oubei Town, Yongjia County, Zhejiang Province, China
Zip Code: 325105
Office Hour: 9:00 – 18:00 Beijing Time, Mon-Fri
IS09001: 2015
IS045001: 2018
NBBI
IBExU
ASME UV
Reviews
As a petrochemical product manufacturer, CNOOC Oil & Gas (Taizhou) Petrochemical Co., Ltd. is committed to ensuring the continuity and stability of production and operation of each unit. In order to ensure the annual production target, under the correct leadership of our company's leaders, all staff have carefully organized and worked hard. The company's production work is being carried out in an orderly manner according to the plan, and the four major controls are fully controllable. Your company made outstanding contributions to us in the supply in the fourth quarter of 2017, which reflects the good strategic partnership between your company and CNOOC Oil & Gas (Taizhou) Petrochemical Co., Ltd. Here, we would like to express our sincere gratitude to the leaders and relevant staff of your company for their strong support.
CNOOC Oil & Gas (Taizhou) Petrochemical Co., Ltd.
Luofu is trustworthy in terms of product quality, price, delivery time and after-sales service.
PetroChina Guangxi Petrochemical Company
Our company is the EPC contractor of 476 system unit safety valves for the ZhongKe (Guangdong) Refinery & Petrochemical Company limited Refining and Chemical Integration Project. We use the safety valve products of Luofu Valve Group Co., Ltd. After quality inspection, they are stable and run well.
Sinopec Luoyang Engineering Co., Ltd.
Thank you Luofu Valve for your cooperation all the time! You have given us all-round support in safety valve technology selection and pre-sales service.
Moon Environment Technology Co., Ltd.
As an OEM supplier, your company always puts product quality and innovation at the top of the enterprise development, which is impressive. The Safety Valve and Changeover Valve Lockable Combination used on our company's compressors are of reliable quality and timely delivery!
ShenGu Group