End Closure For Plastic Pipes Manufactured From Durable Stainless Steel Or Carbon Steel For Long Lasting Pressure Testing
Product Overview
These DN400mm sealing closures—fabricated from either stainless steel or carbon steel—are purpose-built for end-sealing of PVC and PE pipes during internal pressure testing procedures. High-temperature resistant silicone seal rings are pre-installed within precision-machined seal grooves to ensure reliable performance.
Working Principle
Integrated metal compression rings on the closures exert uniform compressive force on the silicone seal rings. Under applied pressure, the silicone O-rings undergo elastic deformation to fill the clearance between the closures and pipe ends, thereby forming a tight, leak-free seal that ensures the integrity of the pressure testing environment.
Structural Composition
This hydrostatic testing fixture comprises:
- Semicircular base
- O-shaped silicone rubber sealing ring
- Pressure ring
- Fastening clamp
- Fastening bolts
- Compression bolts
- Vent valve
Each component is engineered to work in tandem, with the sealing ring ensuring leak-proof connections and the vent valve facilitating air release to guarantee the accuracy of pressure testing data.
Applications
These closures are specifically engineered to deliver secure end-sealing for pipe specimens including PVC, PE, PP-R, ABS, and composite pipes, supporting a comprehensive array of performance assessments such as hydrostatic pressure testing, burst testing, and negative pressure testing.
Fixture Structure
This component features a semicircular trough structure, which facilitates quick assembly, delivers leak-tight sealing performance, and enables highly user-friendly operation during testing. Custom diameter specifications can be tailored to meet specific customer requirements, with material options including 304 stainless steel or carbon steel to accommodate diverse application needs.
Compliance Standards
GB/T 6111, EN921, ISO1167, ASTM D 1598/1599
Available Models
φ8, φ10, φ16, φ25, φ32, φ40, φ50, φ63, φ75, φ90, φ110, φ125, φ140, φ160, φ180, φ200, φ225, φ250, φ280, φ315, φ355, φ450, φ500, φ560, φ630, φ710, φ800, φ900, φ1000, φ1100, φ1200, φ1400, φ1600, φ1800, φ2000mm and British standard, American standard, etc.
Technical Parameters
| Parameter |
Specification |
| Product name |
Stainless steel caps |
| Color |
Silvery white |
| Outline dimension |
φ590*340mm |
| Applicable pipe's diameter |
φ400~φ404mm |
| Max. Pressure |
4MPA |
| The size of seal ring |
φ395*12mm |
| End cap connector |
M12*1.25, 1/4'', 3/8"(customizable) |
| Type |
Type A |
| Packing |
Standard export wooden |
| Certificate |
ISO |
| Delivery time |
5~7 days |
Frequently Asked Questions
Q1: What is the required surface roughness of the fixture's sealing contact area, and how does it affect sealing performance?
The sealing contact surface of the fixture has a roughness of Ra 0.8-1.6 μm, which is precision-machined to ensure tight fit with pipe ends. This smooth surface finish prevents seal ring damage caused by burrs or unevenness, and eliminates micro-gaps that could lead to pressure leakage during high-pressure testing.
Q2: What is the adjustable range of clamping force for the hydrostatic fixture, and how is it controlled?
The fixture's clamping force can be adjusted within the range of 5-50 kN, and it is regulated by torque-controlled fastening bolts. A calibrated torque wrench is recommended for operation—this ensures that the clamping force matches the pipe wall thickness (ranging from 2 mm to 50 mm) without causing pipe end deformation, which is critical for maintaining test accuracy.
Q3: What types of test media are compatible with the hydrostatic fixture, and are there any material restrictions for different media?
The fixture is compatible with common test media including deionized water, glycerol-water mixture, and mineral oil. For water-based media, both 304 stainless steel and carbon steel fixtures are applicable; for oil-based or weakly corrosive media, only 304 stainless steel fixtures are recommended, as carbon steel fixtures may suffer from rusting after long-term contact with oil.
Q4: What is the repeat positioning accuracy of the fixture when switching between different pipe diameters, and how does it impact test results?
The fixture has a repeat positioning accuracy of ±0.2 mm when replacing adapter parts for different pipe diameters. This high precision ensures that the pipe axis remains aligned with the fixture's pressure inlet in each test, avoiding eccentric pressure loading that would otherwise cause biased burst pressure data.
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