UPVC Dialock 2 Way Diaphragm Valve
UPVC Dialock 2 Way Diaphragm Valve is a type of manually operated diaphragm valve that is used with a handwheel with a locking mechanism to control flow in two directions (inlet and outlet) by moving a flexible diaphragm up and down to open or close the flow path. The UPVC Dialock 2 Way Diaphragm Valve is so quiet and lightweight. Therefore, the quick locking feature on the handwheel allows the handwheel to be moved and secured in any position.
UPVC Dialock 2 Way Diaphragm Valve is used to control and shut off scratchy substances. The body’s redesigned internal shape enhances flow coefficient and pressure drop, allowing for delicate and accurate shutter adjustment over the whole stroke. Many different materials, body styles, and diaphragms may be used with this UPVC Dialock 2 Way Diaphragm Valve. Weir-style body redesign improves the flow rate and allows for accurate linear flow regulation across the valve’s complete range of operation. There are a variety of choices and accessories available with this pneumatically operated variant.
- Chemical Resistance
- Low Maintenance Requirement
- Low Thermal Conductivity
- Long Service Life
- Easy Installation
- Corrosion Resistance
UPVC Dialock 2 Way Diaphragm Valve Details
d – Pipe Outside Diameter (or Nominal Pipe Size in Inches)
DN – Diameter Nominal (Standard Metric Pipe Size)
R1 – Reduced Size / Branch Size (Reducer dimension)
PN – Pressure Nominal (Pressure Rating, in bar)
B1 – Body Length / Base Dimension
E – Engagement Length / Socket Depth
H – Total Height
H1 – Height to Branch / Secondary Height
| Size (DN) | Size (Inch) | D | b | k | h | d | Weight (kg) |
| 15 | 1/2″ | 95 | 14 | 65 | 45 | 14 | 0.8 |
| 20 | 3/4″ | 105 | 16 | 75 | 50 | 14 | 1.0 |
| 25 | 1″ | 115 | 16 | 85 | 52 | 14 | 1.2 |
| 32 | 1 1/4″ | 140 | 18 | 100 | 55 | 18 | 1.9 |
| 40 | 1 1/2″ | 150 | 18 | 110 | 58 | 18 | 2.3 |
| 50 | 2″ | 165 | 20 | 125 | 62 | 18 | 3.1 |
| Parameter | Specification / Description |
| Valve Type | 2-Way Diaphragm Valve (Weir type, linear flow control) |
| Body Material | UPVC (PVC-U) |
| Bonnet & Handwheel | PP-GR (Glass-reinforced Polypropylene) |
| Diaphragm Material | EPDM / PTFE / FKM |
| Stem / Internal Parts | Stainless steel (Isolated from fluid) |
| Size Range | DN15 to DN150 (½″ to 6″) |
| Pressure Rating | PN10 / PN16 (≈ 10–16 bar at 20°C) |
| Temperature Range | 0°C to 60°C |
| Operation Type | Manual (DIALOCK® Handwheel) / Optional Pneumatic |
| Locking System | Position locking handwheel (300+ positions) |
| End Connections | Socket, Threaded, Flanged |
| Flow Control | Precise linear throttling + Bubble-tight shut-off |
| Design Type | Weir-type with optimized flow geometry |
| Flow Efficiency | High flow coefficient ($C_v$), low pressure drop |
| Position Indicator | Integrated optical position indicator |
| Corrosion Resistance | Excellent (Acids, alkalis, chemicals) |
| Surface Finish | Smooth internal surface (Prevents scaling) |
| Maintenance | Easy diaphragm replacement (Top-entry) |
| Standards | ISO, ASTM, DIN, ANSI, JIS |
- UPVC Construction
Resistant to corrosion, chemicals, and moisture. - Dialock Mechanism
Handwheel position can be locked for precise flow control and safety. - Diaphragm Operation
Flexible diaphragm provides bubble-tight sealing and isolates the fluid from the operating parts. - 2-Way Flow Design
Single inlet and outlet for on/off or throttling applications. - Bi-Directional Flow
Allows flow in either direction without affecting performance. - Manual Operation
Simple handwheel control; easy to operate. - Throttling and On–Off Control
Can regulate flow or fully isolate the line. - Lightweight and Compact
Easy to install and handle compared to metal valves. - Low Maintenance
Few moving parts; diaphragm is replaceable. - Visual Position Indication
The dialock system shows valve opening clearly. - Safe Operation
Fluid is completely isolated from the stem and handwheel; no electrical hazard. - Versatile Applications
Oil & gas treatment, chemical dosing, industrial processes, pharmaceuticals, and corrosive fluid handling.
| Specification | Pressure Rating | Notes / Conditions |
| Nominal Pressure (PN) | PN 10 | Typical rating with water at 20 °C for standard UPVC Dialock diaphragm valves. |
| Working Pressure | 10 bar (~145 psi) | Confirmed max rated pressure for Dialock® 2‑way diaphragm valves. |
| Alternative Working Value | 150 psi (~10.3 bar) | Typical UPVC diaphragm valves pressure rating at ~73 °F (23 °C) for some models. |
| Pressure Range (other thermoplastics) | PN 6 – 10 | Depending on material (PVC‑U, CPVC etc.); UPVC usually at the upper end. |
Custom Product Manufacturing Available
If you are searching for customized product designs that meet your requirements, don’t worry. Petron Thermoplast also offers custom product manufacturing services to meet the unique needs of various industries. Work with our expert engineers to create custom designs suited for your application.
Benefits of Using UPVC Dialock 2 Way Diaphragm Valve
Corrosion Resistant
UPVC check valve does not rust, pit, or scale, also making it ideal for water, wastewater, and many chemical applications.
Lightweight
UPVC is much lighter than metal valves, so it is easier to handle, transport, and install.
Low Cost
These are generally cheaper than metal or specialty plastic valves, both in initial cost and installation.
Low Maintenance
No corrosion means fewer failures, longer service life, and minimal upkeep.
Smooth Internal Surface
They reduce the pressure loss and prevent the buildup or fouling inside the valve.
Good Chemical Compatibility
Upvc Check Valves are suitable for acids, alkalis, salts, and many industrial and chemical applications.
Electrical & Thermal Insulation
They are non-conductive, so there are no galvanic corrosion and stray current issues.
Quiet Operation
Especially true for ball-type or spring-loaded designs—less water hammer compared to metal valves.
Easy Installation
The availability of easy installation with threaded, flanged, and socket ends makes it simple to join using methods like solvent cementing.
Non-Contaminating
Upvc check valve not to leach metals into the fluid and safe for potable water in approved grades.
Types of UPVC Dialock 2 Way Diaphragm Valve
1. Based on Actuation / Operation
- Manual Dialock Valve
- Operated with a handwheel and Dialock mechanism.
- Provides precise on/off or throttling control.
- Pneumatic Actuated Dialock Valve
- Uses air pressure to operate the diaphragm.
- Can be integrated into automated systems for remote control.
2. Based on Flow Control Function
- On–Off Type
- Designed for fully open or fully closed operation.
- Simple, reliable isolation valve.
- Throttling / Modulating Type
- Allows partial opening for flow regulation.
- Ideal for dosing, chemical injection, or process control.
3. Based on End Connection
- Socket / Spigot Type
- For solvent welding or push-fit connections.
- Common in small-diameter piping.
- Flanged Type
- Bolted flange connection for larger pipes.
- Easier maintenance and assembly.
4. Based on Diaphragm Material
- EPDM Diaphragm
- Suitable for chemical, mild acids, and alkalis.
- Suitable for chemical, mild acids, and alkalis.
- PTFE / Teflon Diaphragm
- For aggressive chemicals, solvents, or high-purity fluids.
- For aggressive chemicals, solvents, or high-purity fluids.
- NBR / Buna-N Diaphragm
- For oils and non-aggressive chemicals.
5. Based on Flow Direction
- Bi-Directional Valve
- Flow can pass in either direction without affecting performance.
- Common in standard 2-way valves.
Why Choose Petron Thermoplast?
In the field of Oil, gas, water fluid, and chemical injection technology, Petron Thermoplast Company played a leading role, known for innovation and reliability. Petron Thermoplast has engineered high-performance UPVC Dialock 2 Way Diaphragm Valves that maximize mixing efficiency and durability. Their design is patented to ensure consistent performance across a wide range of flow rates and pressures.
Petron Thermoplast UPVC Dialock 2 Way Diaphragm Valves are particularly favored in chemical treatment applications due to their precision, long service life, and compatibility with corrosive water.
Suitable for Industrial & Utility Applications
Our UPVC Dialock 2 Way Diaphragm Valves are widely used in Oil, gas treatment plants, effluent systems, cooling water lines, chemical handling (mild chemicals), and industrial utilities.
Export-Grade Quality & Standards Compliance
All UPVC Dialock 2 Way Diaphragm Valves are manufactured under strict quality control and comply with international standards, making them suitable for domestic and global projects.
Trusted by EPCs, OEMs & Industries
Petron Thermoplast is a preferred supplier for EPC contractors, OEMs, and industrial operators, offering consistent quality, competitive pricing, and dependable supply.
