PEEK Soft-Seal Ball Valve Pressure Resistance Chart

PEEK Soft-Seal Ball Valve Pressure Resistance Chart

Note: The following data is based on standard pure PEEK seal material (316 stainless steel valve body). For modified PEEK (carbon fiber/glass fiber reinforced), the pressure resistance can be increased by 15%-30% under the same temperature conditions. The data is for reference only; the actual pressure resistance shall be subject to the manufacturer's test report13.

1. Temperature-Pressure Relationship Curve

2. Pressure Resistance Reference Table (by Nominal Diameter)

Nominal Diameter (DN)
Temperature Range
Maximum Working Pressure (PN)
Corresponding Pressure (bar/MPa)
Applicable Notes

DN15~DN50
-40°C~200°C
PN100
100 bar / 10 MPa
Suitable for high-pressure instrument pipelines, hydraulic systems

DN15~DN50
200°C~250°C
PN21~PN12
21 bar~12 bar / 2.1 MPa~1.2 MPa
Temperature margin ≥15% is required

DN65~DN200
-40°C~200°C
PN40
40 bar / 4 MPa
Flange connection is preferred; avoid threaded connection

DN65~DN200
200°C~250°C
PN16~PN10
16 bar~10 bar / 1.6 MPa~1.0 MPa
Reinforced PEEK is recommended

DN250及以上
-40°C~200°C
PN16
16 bar / 1.6 MPa
Only suitable for low-pressure large-flow scenarios

3. Key Influencing Factors of Pressure Resistance

Temperature: The higher the temperature, the lower the pressure resistance; when exceeding 200°C, the pressure resistance drops significantly1.
Nominal Diameter: The larger the DN, the lower the maximum applicable pressure under the same temperature condition.
Material Modification: Carbon fiber/glass fiber reinforced PEEK can improve pressure resistance and wear resistance5.
Valve Body Material: The pressure resistance of the valve is also limited by the valve body material; the data above is based on 316 stainless steel.

Selection Principles for Valve Soft Seal Materials: PTFE, NYLON, PEEK

Valve soft seal materials PTFE (Polytetrafluoroethylene), NYLON (Polyamide), and PEEK (Polyetheretherketone) have distinct differences in temperature resistance, chemical compatibility, pressure resistance, and wear resistance. The selection shall be based on core working conditions such as medium type, operating temperature, pressure level, and service life requirements. The following are the detailed selection principles and comparative analysis.

Nominal Diameter (DN)	Temperature Range	Maximum Working Pressure (PN)	Corresponding Pressure (bar/MPa)	Applicable Notes
DN15~DN50	-40°C~200°C	PN100	100 bar / 10 MPa	Suitable for high-pressure instrument pipelines, hydraulic systems
DN15~DN50	200°C~250°C	PN21~PN12	21 bar~12 bar / 2.1 MPa~1.2 MPa	Temperature margin ≥15% is required
DN65~DN200	-40°C~200°C	PN40	40 bar / 4 MPa	Flange connection is preferred; avoid threaded connection
DN65~DN200	200°C~250°C	PN16~PN10	16 bar~10 bar / 1.6 MPa~1.0 MPa	Reinforced PEEK is recommended
DN250及以上	-40°C~200°C	PN16	16 bar / 1.6 MPa	Only suitable for low-pressure large-flow scenarios