PPH Dialock 2 Way Diaphragm Valve
A PPH Dialock 2 Way Diaphragm Valve is a type of industrial control valve made from Polypropylene Homopolymer (PPH) that is designed to start, stop, or regulate the flow of fluids through a piping system using two ports (inlet and outlet). This valve utilizes a flexible diaphragm that moves up and down to seal against a weir or seat within the valve body, ensuring a tight shut-off and leak-free operation. The Dialock mechanism is a special locking handwheel design that allows precise flow adjustment and prevents accidental valve movement during operation.
PPH Dialock 2 Way Diaphragm Valves are commonly used in chemical processing, water treatment plants, pharmaceutical industries, and corrosive fluid handling systems because PPH material provides excellent chemical resistance, corrosion resistance, and long service life.PPH Dialog 2 Way Diaphragm Valve is used to control and shut off dirty or scratched substances. The valve is quite small and lightweight. There is an ergonomic and quick locking feature on the handwheel, allowing the handwheel to be moved and secured in any position.
- Chemical Resistance
- Low Maintenance Requirement
- Low Thermal Conductivity
- Long Service Life
- Easy Installation
- Corrosion Resistance
PPH Dialock 2 Way Diaphragm Valve Details
*Technical Diagram
*Technical Data
| Parameter / Property | Technical Specification / Typical Value |
| Valve Type | Dialock 2-Way Diaphragm Valve |
| Body Material | PPH (Polypropylene Homopolymer) |
| Diaphragm Material | EPDM / PTFE |
| Size Range | DN15 – DN100 (½” – 4”) |
| Nominal Pressure | PN6 – PN10 |
| Temperature Range | 0°C to 90°C (Material dependent) |
| End Connection | Socket Weld / Flanged / Threaded |
| Operation Type | Manual Handwheel with Dialock system |
| Flow Direction | Two-way flow (Inlet and Outlet) |
| Mounting Position | Horizontal or Vertical installation |
| Stem Material | Stainless Steel |
| Sealing System | Flexible diaphragm sealing |
| Design Standard | DIN / ISO standards |
| Working Medium | Water, acids, alkalis, and chemical fluids |
| Body Design | Weir-type diaphragm valve construction |
| Density | 0.90 – 0.91 g/cm³ |
| Tensile Strength | 30 – 35 MPa |
| Flexural Modulus | 1300 – 1600 MPa |
| Impact Strength | Good impact resistance |
| Hardness | Shore D 65 – 75 |
| Thermal Conductivity | ~0.22 W/m·K |
| Coefficient of Thermal Expansion | 1.5 – 2.0 × 10⁻⁴ /°C |
| Maximum Working Temp | Up to 90°C |
| Water Absorption | Very low (<0.01%) |
| Chemical Resistance | Excellent (Acids, Alkalis, Chemicals) |
| Electrical Insulation | Good electrical insulating properties |
- Dialock Handwheel Mechanism
The valve is equipped with a Dialock locking system that allows precise flow control and prevents accidental movement of the valve position. - High Chemical Resistance
Made from PPH (Polypropylene Homopolymer), the valve offers excellent resistance to acids, alkalis, and corrosive chemicals. - Leak-Proof Diaphragm Sealing
The flexible diaphragm ensures tight shut-off and reliable sealing, preventing leakage during operation. - Corrosion-Resistant Body
The non-metallic PPH body prevents rust and corrosion, making it suitable for aggressive chemical environments. - Compact and Lightweight Design
The valve has a compact structure and lightweight material, which makes installation and handling easier. - Smooth Internal Surface
The smooth interior reduces friction, minimizes pressure drop, and prevents scaling or buildup. - Isolation of Internal Parts
The diaphragm separates the operating components from the fluid, protecting internal parts from corrosion and contamination. - Low Maintenance Design
The diaphragm can be replaced easily, reducing maintenance time and cost. - Multiple Connection Options
Available with socket weld, threaded, or flanged connections for flexible installation. - Wide Industrial Applications
Suitable for chemical processing, water treatment, pharmaceutical, and industrial fluid handling systems.
| Valve Size (DN) | Pressure Class | Maximum Working Pressure | Test Pressure |
| DN15 – DN25 (½” – 1”) | PN10 | Up to 10 Bar | 15 Bar |
| DN32 – DN50 (1¼” – 2”) | PN10 | Up to 10 Bar | 15 Bar |
| DN65 – DN80 (2½” – 3”) | PN6 | Up to 6 Bar | 9 Bar |
| DN100 (4”) | PN6 | Up to 6 Bar | 9 Bar |
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 PPH Dialock 2 Way Diaphragm Valve
Excellent Chemical Resistance
The PPH material provides strong resistance to acids, alkalis, and corrosive chemicals, making the valve suitable for chemical processing systems.
Leak-Tight Sealing
The flexible diaphragm ensures a tight shut-off and prevents leakage, improving the safety and efficiency of the piping system.
Dialock Safety Mechanism
The Dialock handwheel system allows precise adjustment and locks the valve position, preventing accidental movement during operation.
Corrosion-Free Performance
PPH material does not rust or corrode like metal valves, ensuring long service life in harsh environments.
Lightweight Construction
The valve is lighter than metal valves, making handling, transportation, and installation easier.
Low Maintenance Requirement
The simple design and easily replaceable diaphragm reduce maintenance time and cost.
Smooth Flow Characteristics
The internal surface of the valve is smooth, which helps reduce pressure loss and prevent scale buildup.
Long Service Life
Due to high chemical resistance and durable construction, the valve offers reliable and long-lasting performance.
Good Temperature Resistance
PPH valves can handle moderate temperatures commonly found in industrial fluid systems.
Wide Range of Applications
Suitable for use in water treatment, chemical plants, pharmaceutical industries, and industrial fluid handling systems.
Types of PPH Dialock 2 Way Diaphragm Valve
Manual PPH Dialock 2 Way Diaphragm Valve
This type is operated using a handwheel with a Dialock mechanism, allowing manual control of the valve opening and closing.
Pneumatic PPH Dialock 2 Way Diaphragm Valve
This valve is operated using a pneumatic actuator with compressed air, making it suitable for automated industrial processes.
Electric (Motorized) PPH Dialock 2 Way Diaphragm Valve
In this type, an electric actuator is used to control the valve remotely in automated systems.
Socket End PPH Dialock 2 Way Diaphragm Valve
This type has socket weld connections, which are commonly used in thermoplastic piping systems.
Flanged PPH Dialock 2 Way Diaphragm Valve
This valve comes with flanged ends, making it suitable for larger pipelines and high-strength connections.
Threaded End PPH Dialock 2 Way Diaphragm Valve
This type uses threaded connections, which allow easy installation and removal in smaller piping systems.
Applications of PPH Dialock 2 Way Diaphragm Valve
Process Industry
High Purity Applications
Electronic Industry
Electrical Industry
Semi-conductors Industry
Pharmaceutical Industry
Solar power panels
Sugar Industry
Paper & Pulp Industry
Nuclear Power Industry
Automotive Industry
DI water plants
Why Choose Petron Thermoplast?
Petron Thermoplast is a trusted manufacturer and supplier of PPH Dialock 2 Way Diaphragm Valve, engineered to deliver reliable backflow prevention, long service life, and consistent performance in demanding industrial environments.
1. Multiple Size & Seal Options
Available in a wide range of sizes with EPDM and FKM (Viton) seals, allowing selection based on pressure, temperature, and chemical compatibility.
2. Strict Quality Control
Every PPH Dialock 2 Way Diaphragm Valve undergoes rigorous quality checks to ensure leak-proof performance, durability, and consistent field reliability.
3. Cost-Effective for Industrial Projects
As a manufacturer, Petron Thermoplast offers competitive pricing for bulk orders and EPC projects without compromising on quality.
4. Trusted Industrial Partner
With extensive experience in industrial thermoplastics, Petron Thermoplast is a preferred supplier for chemical plants, oil, gas treatment facilities, OEMs, and EPC contractors.
