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Resilient Seated Gate Valve DN50-DN150 PN10/PN16: Design, Materials & Full Technical Specifications (Technical Article)
2026-10-05
GTF Resilient Seated Gate Valve: Z45X-100/16Q
The GTF Z45X-100/16Q resilient seated gate valve is designed for pipeline isolation applications.
According to the technical drawing, the valve is available in nominal sizes from DN50 to DN150 and can be configured for PN10 and PN16 pressure ratings.
The technical configuration includes a ductile iron valve body, resilient sealing components and stainless-steel-related internal components.
The design is intended for water and weakly corrosive fluid service within the specified temperature and pressure conditions.
Main specifications
| Item | Specification |
|---|---|
| Valve Type | Resilient Seated Gate Valve |
| Model | Z45X-100/16Q |
| Nominal Size | DN50-DN150 |
| Nominal Pressure | PN10 / PN16 |
| Applicable Medium | Water and weak corrosive fluid |
| Applicable Temperature | -15°C to 80°C |
| Body Material | QT500-7 |
| Disc Material | QT500-7 + EPDM |
| Gasket | NBR |
| Valve Seat O-Ring | EPDM |
| Stem Nut | 2Cr13 |
| Bearing | ZCuAl10Fe3 |
| Gland Flange | QT500-7 |
| Hand Wheel | QT500-7 |
The actual valve configuration should always be confirmed against the project specification, required standards, operating conditions and approved technical documentation.
Key Materials Used in the Valve
Ductile Iron Valve Body
The valve body specified in the drawing uses QT500-7 ductile iron.
Ductile iron is widely used for water valve bodies because it provides a practical combination of mechanical strength, castability and durability for pipeline applications.
The body also determines important dimensional characteristics of the valve, including the flange connection, overall height and face-to-face length.
Resilient Seated Disc
The disc specification shown in the drawing is:
QT500-7 + EPDM
The EPDM resilient sealing material provides the elastomeric sealing surface required for the valve's shut-off function.
For water applications, EPDM is commonly selected when its chemical compatibility and temperature range are appropriate for the service conditions.
Stainless Steel Stem
The drawing specifies 2Cr13 for the stem nut-related component listed in the material table.
Internal materials should be selected according to the valve design, operating environment and required corrosion resistance.
For projects with special water chemistry, higher corrosion resistance or different operating conditions, the material specification should be confirmed before production.
Pressure Rating: PN10 vs PN16
One of the most important considerations when selecting a water gate valve is the nominal pressure rating.
The GTF drawing specifies:
PN10 / PN16
The correct pressure class should be selected according to the pipeline design pressure and project requirements.
A PN16 valve should not simply be selected because it has a higher nominal pressure designation. Engineers should also consider:
- Operating pressure
- Pressure fluctuations
- Water hammer
- Pipeline design conditions
- Temperature
- Applicable standards
- Flange connection requirements
For a specific project, GTF can review the customer's pipeline requirements and confirm the appropriate pressure class.
Available Sizes: DN50 to DN150
The technical drawing provides dimensional information for:
- DN50
- DN65
- DN80
- DN100
- DN150
The dimensional table includes the main connection and installation dimensions, including:
DN, ØD, ØK, N-ØL, Ød, H and L.
For example, the drawing specifies a face-to-face dimension L of:
These dimensions are important when replacing an existing valve or designing a new pipeline because the valve must fit the available installation space.
Before ordering, the buyer should confirm the required flange standard, pressure rating, face-to-face dimension and connection dimensions.
Testing and Inspection Requirements
Valve testing is an important part of quality control for water pipeline applications.
The GTF technical drawing specifies testing and inspection according to relevant GB/T standards, including:
- GB/T 17241.6-2008
- GB/T 13927-2008
The pressure specifications shown in the drawing include:
| Test | PN10 | PN16 |
|---|---|---|
| Shell Test | 1.5 MPa | 2.4 MPa |
| Back Seat Test | 1.1 MPa | 1.76 MPa |
| Seat Seal Test | 1.1 MPa | 1.76 MPa |
| Air Seal Test | 1.5 MPa | 2.4 MPa |
The exact testing procedure and acceptance criteria should follow the applicable project standard and approved inspection requirements.
For export projects, buyers can also request relevant inspection and pressure test documentation according to their project requirements.
Face-to-Face Dimensions and Installation
Face-to-face dimensions are particularly important when selecting replacement gate valves.
The technical drawing references GB/T 12221-2005 for structural length requirements and GB/T 12232-2005 for the design and manufacturing requirements specified for the valve.
For international projects, however, the buyer should not assume that a GB-standard valve will automatically have the same dimensions as a DIN, EN, BS or AWWA valve.
Before ordering, it is recommended to confirm:
- Nominal diameter
- Pressure class
- Flange standard
- Face-to-face dimension
- Installation dimensions
- Valve body material
- Sealing material
- Testing standard
This is especially important when replacing valves in an existing water pipeline.
Where Are Resilient Seated Gate Valves Used?
Resilient seated gate valves can be used in various water-related applications when the valve specifications match the service conditions.
Municipal Water Supply
Gate valves can be installed in water distribution networks to isolate sections of pipeline during maintenance or system operation.
Water Treatment
Water treatment facilities require reliable isolation valves throughout different stages of water handling and distribution.
Industrial Water Systems
Industrial plants may use gate valves in cooling water, process water and general utility water pipelines, subject to media compatibility.
Fire Protection
Gate valves can also be used in suitable fire protection pipeline configurations when the required certification, standard and project specifications are met.
How to Choose the Right Resilient Seated Gate Valve
When purchasing a gate valve, the valve model alone is not enough.
A professional RFQ should normally include:
1. Nominal Size
For example:
DN50, DN65, DN80, DN100 or DN150.
2. Pressure Rating
PN10 or PN16.
3. Flange Standard
Confirm whether the project requires GB, EN/DIN, BS, AWWA or another flange standard.
4. Face-to-Face Dimension
This is particularly important for replacement projects.
5. Body Material
For example, ductile iron QT500-7.
6. Sealing Material
For water applications, EPDM may be considered where compatible with the operating conditions.
7. Medium
Water, wastewater or other fluid.
8. Operating Temperature
Confirm the actual operating temperature rather than selecting a valve based only on nominal pressure.
9. Testing Requirements
Confirm the required pressure testing and inspection standards.
10. Documentation
Depending on the project, buyers may require:
- Material Test Certificate
- Pressure Test Report
- Inspection Report
- Dimensional Drawing
- Product Datasheet
- Certificate of Compliance
Why Technical Documentation Matters When Buying Water Valves
For an international valve buyer, a product photo alone is not enough to evaluate whether a valve is suitable for a project.
A proper technical drawing provides information about:
- Valve dimensions
- Pressure rating
- Material specifications
- Component structure
- Testing requirements
- Applicable standards
- Installation dimensions
This information helps engineers and purchasing teams compare products before placing an order.
At GTF, technical documentation can be provided according to the valve configuration and project requirements.
GTF – Water Valve Manufacturer in China
GAOTE HOLDING GROUP CO., LTD. (GTF) focuses on the development and manufacturing of water valves and related fluid control products.
Our valve products are designed for applications including:
- Water supply
- Water treatment
- Municipal water systems
- Fire protection
- Drainage
- Industrial fluid pipelines
For international projects, valve specifications can be customized or confirmed according to the required size, pressure rating, flange standard, material, sealing material, testing requirements and application conditions.
If you are sourcing resilient seated gate valves for a water project, send us your required DN, PN, flange standard, quantity and application. Our technical team can review the requirements and recommend a suitable configuration.
GAOTE HOLDING GROUP CO., LTD.
Industrial Valve Manufacturer
Website: www.gaotejituan.com
WhatsApp: +86 13400888017
Email: gaotegroup@126.com
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Email: gaotegroup@126.com
Address: Chenggong Development Zone, Ximei Street, Nan'an City, Quanzhou City, Fujian Province
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