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Custom Industrial Flow Control Valves Manufacturers
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UPVC Safety Valve/Back Pressure ValveSafety valves and back pressure valves are essential protective and regulating components in fluid p...
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Stainless Steel Safety Valve/Back Pressure ValveSafety valves and back pressure valves are essential protective and regulating components in fluid p...
Custom Industrial Flow Control Valves Manufacturers
SYEELAI is a manufacturing enterprise based in Yixing, China, focused on corrosion-resistant fluid handling. We design and build liquid mixers, chemical pumps, filters and valve packages, then integrate them into custom dosing and transfer systems for chemical, environmental, water treatment, electroplating, petrochemical and pharmaceutical plants.
In this product category we act as a full-process supplier rather than a valve trader. Our Flow Control Valves and Accessories range is specified around your medium, pressure profile and piping material, and delivered with the engineering context needed to make it work on your line.
Valve range we supply
The child category inside this family is the Back Pressure Valve, covering two construction families: UPVC safety valve/back pressure valve and stainless steel safety valve/back pressure valve. Both perform the same protective function, but the material choice changes the acceptable media, pressure level and installation environment.
| Construction family | Typical line position | Best fit |
|---|---|---|
| UPVC Safety Valve / Back Pressure Valve | Discharge side of plastic metering and transfer lines | Acid and alkali transfer, electroplating dosing, water treatment chemicals, low-pressure chemical injection |
| Stainless Steel Safety Valve / Back Pressure Valve | Metallic piping trains and pressure-rated dosing skids | Petrochemical injection, pharmaceutical batch dosing, hot media, high-integrity process systems |
The valve is normally installed after the metering pump discharge and before the injection point. It maintains a minimum upstream pressure, prevents syphoning and overfeeding when the pump is idle, and protects the pump from pressure spikes. In reciprocating pump systems it is often combined with a Pulsation Damper to keep the hydraulic profile stable.
Where each valve family fits
- UPVC construction is the common choice when the piping system is plastic and the media are aggressive acids, alkalis or water-treatment chemicals. It keeps the valve wetted materials compatible with the line and avoids metallic contamination in sensitive baths.
- Stainless steel construction fits metallic or skid-mounted systems where pressure, temperature or plant specification requires a metal-bodied valve. It is also preferred for pharmaceutical, petrochemical and other high-integrity services.
- Safety valve function opens at the set point to discharge excess pressure and protect downstream equipment.
- Back pressure function holds a stable upstream pressure so a metering pump does not lose prime or overfeed during idle periods.
Engineering value and integration support
Because we manufacture the adjacent pump, mixer, filter and valve technologies, we can evaluate the complete discharge line instead of supplying an isolated component. On a dosing skid, the valve setting must match the pump discharge pressure, the static head at the injection point, and the pressure drop through piping and accessories.
Our proposal identifies that operating window and documents the set point used for the factory check. The same valve can be supplied as a spare part, as part of a valve and accessories package, or integrated into a complete dosing skid built to your process specification.
- Set-pressure selection based on pump discharge character and required line back pressure
- End connections and line size matched to your piping standard
- Material combination selected after review of chemical concentration and temperature
- Coordination with pulsation damper where reciprocating pump pulsation is present
- Documentation that supports installation, commissioning, pump stroke control and PLC interlock integration
Quality assurance and project delivery
Flow control valves are covered by our standardized quality inspection system: raw materials are sampled and verified on arrival, fixed-point patrol inspections run during production, and finished products receive full-performance verification. Complete inspection data is retained so each valve can be traced from source to delivery.
- Incoming material verification records
- In-line inspection during machining and assembly
- Finished-product function checks before release
- Industrial-grade protective packaging for chemical plant and export shipment
- 24/7 responsive service covering remote diagnosis, on-site guidance and after-sales maintenance
Information we use to configure your solution
To prepare a suitable proposal, we need the following process data:
- Chemical name, concentration, temperature, specific gravity and viscosity
- Pump type, flow range and discharge pressure from the pump datasheet
- Maximum working pressure and required back-pressure set point
- Line size, connection standard and piping material
- Installation orientation, available space and ambient conditions
- Documentation language and test report requirements
Installation, commissioning and maintenance
Before installation, flush the line and support the piping so no external load distorts the valve body. The flow direction is marked on the body; use the orientation agreed during the engineering review. During commissioning, check the set pressure and seat sealing at the actual operating point.
Periodic maintenance should include set-pressure verification, seat and seal inspection, and replacement of diaphragm or spring parts when the valve no longer holds its setting. Our service team provides remote diagnosis and on-site guidance through the full equipment life cycle.
Frequently asked questions
Which material should we choose, UPVC or stainless steel?
UPVC suits corrosive acid and alkali media in plastic piping systems and is common for water treatment and plating lines. Stainless steel is selected where temperature, system pressure or plant specification excludes plastic materials. We confirm the material after reviewing your medium and operating data.
Where is a back pressure valve installed on a dosing line?
Normally downstream of the metering pump discharge, before the injection point. It maintains minimum upstream pressure and prevents syphoning or overfeeding at low pump strokes. The exact position depends on pump type, pipe length and injection point pressure.
Can you integrate the valve into a complete dosing or filtration system?
Yes. We undertake the design, installation and commissioning of non-standard chemical filtration systems and customized dosing devices. The valve can be ordered separately or supplied as part of a skid with metering pumps, pulsation dampers, filters and mixers.
What data do you need to size a back pressure valve?
We need the chemical composition and temperature, flow range, pump discharge pressure, required set pressure, line size and connection standard, and the installation environment. With these inputs we select body material, spring or pilot setting, end connections and sealing package.
How do you verify valve performance before shipment?
Our quality system includes full-performance verification of finished products and retained inspection data. For dosing assemblies, the complete skid is checked with the valve in its installed position before release. Service documentation, remote diagnosis and on-site guidance continue after delivery.
Through standardized quality inspection procedures, we strictly control every link from raw materials to finished products, ensuring each product meets high-quality requirements.
+86-13861218983 Telephone
+86-13861218983 whatsapp
[email protected] Email
No. 89, Gehu Road, Gaocheng Town, Yixing City, Jiangsu Province, China Factory
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