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Help CenterVertical Lift Check Valve for Hydraulic Station Oil Return Line Used in Injection Molding Machine
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Shanghai Zhibang Valve Manufacture Co., Ltd. is a professional manufacturer established in 2016, specializing in the production of high-quality industrial valves. Our Vertical Lift Check Valve for Hydraulic Station Oil Return Line is designed specifically for injection molding machine hydraulic systems, ensuring reliable backflow prevention and long service life. With an annual export value of US$1 million to US$1.5 million and ISO9001 certification, we deliver products that meet international standards. This check valve is engineered to withstand high pressure and temperature fluctuations in oil return lines, offering excellent sealing performance and minimal pressure drop.
Our valve features a vertical lift disc design that moves perpendicular to the seat, providing a quick and positive shut-off when flow reverses. The spring-assisted closing mechanism ensures rapid response, preventing water hammer and protecting downstream equipment. Whether you are a injection molding machine OEM or a hydraulic system integrator, this valve is a cost-effective solution for maintaining system efficiency and safety.
Key Features & Benefits
- Vertical Lift Design: The disc moves straight up and down, reducing wear on the seat and ensuring a tight seal even under low flow conditions.
- Spring-Assisted Closing: Eliminates the risk of slamming and reduces noise, extending valve life.
- Compact Structure: Suitable for space-constrained installations in hydraulic stations.
- Wide Material Choice: Available in WCB, CF8, CF8M, and other alloys to match different hydraulic fluid compatibility.
- High Pressure & Temperature Capacity: Rated up to PN40 (Class 300) and 120°C, meeting the demands of injection molding machines.
- Easy Maintenance: Top-entry design allows for quick inspection and replacement of internal parts without removing the valve from the line.
Technical Specifications
| Parameter | Value / Range |
| Nominal Diameter | DN15 – DN200 (0.5″ – 8″) |
| Pressure Rating | PN16 / PN25 / PN40 (Class 150 – 300) |
| Connection Type | Flanged (RF/FF), Threaded (optional) |
| Working Temperature | -20°C ~ +120°C |
| Applicable Medium | Hydraulic oil, lubricating oil, water-glycol solutions |
| Body Material | WCB, CF8, CF8M, or as required |
| Seal Material | PTFE, NBR, Viton (optional) |
| Design Standard | API 6D / BS 1868 (customizable) |
Our vertical lift check valve is specifically designed for oil return lines in hydraulic stations of injection molding machines. The low-pressure drop characteristic ensures minimal energy loss, while the spring-assisted closure prevents reverse flow and protects the pump and other components. Compared to swing check valves, the vertical lift design offers a more reliable seal in vertical installations and handles dirty fluids better due to the self-cleaning action of the disc.
Each valve undergoes rigorous testing before shipment, including hydrostatic shell test, seat leakage test, and functional test. We also provide customization options such as special end connections, extended bonnets for high-temperature applications, and alternative materials for aggressive fluids. Our engineering team can assist in selecting the optimal valve for your specific injection molding machine model.
Frequently Asked Questions (FAQ)
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Q1: What is the difference between a vertical lift check valve and a swing check valve?
A: A vertical lift check valve has a disc that moves up and down perpendicular to the seat, while a swing check valve has a hinged disc that swings open. The vertical lift design is more suitable for high-frequency cycling and offers a tighter seal, especially in vertical pipe runs. -
Q2: Can this valve be used for other fluids besides hydraulic oil?
A: Yes, it can handle lubricating oils, water-glycol mixtures, and other non-corrosive fluids. For aggressive chemicals, we recommend selecting appropriate body and seal materials. -
Q3: What is the minimum pressure required to open the valve?
A: The cracking pressure is typically low (about 0.05 bar) due to the lightweight disc and spring. The exact value depends on the size and spring setting, and can be adjusted upon request. -
Q4: Is the valve suitable for horizontal installation?
A: The vertical lift check valve is primarily designed for vertical installation (flow upward). For horizontal lines, we recommend a swing check or a spring-loaded lift check valve with a horizontal configuration. -
Q5: Do you provide certificates of material and pressure test?
A: Yes, we can provide material test certificates (MTC) according to EN 10204 3.1 and hydrostatic test reports upon request. -
Q6: What is the lead time for standard sizes?
A: For standard materials (WCB) and sizes (DN15-DN100), lead time is typically 15-20 working days. Custom sizes or materials may require 25-30 days. -
Q7: How do I maintain the valve?
A: The top-entry design allows easy access to the disc, spring, and seat. Regular inspection is recommended every 6 months. Replace worn seals or springs as needed. -
Q8: Is there a warranty?
A: We offer a 12-month warranty from the date of shipment against manufacturing defects. Extended warranty is available as an option.
Why Choose Shanghai Zhibang Valve?
Since our establishment in 2016, we have exported over US$1 million worth of valves annually to markets across North America, South America, Europe, Asia, and Africa. Our ISO9001-certified quality management system ensures consistent product quality. We ship from Shanghai, Guangzhou, Hong Kong, and Beijing ports, offering flexible logistics options. Our experienced team provides prompt technical support and after-sales service. Choose our vertical lift check valve for reliable performance in your injection molding machine hydraulic system.
Contact us today for a quote or technical consultation. We are ready to supply vertical lift check valves tailored to your hydraulic station requirements.
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