Chrome‑Moly Safety Valve Price & Selection: Up to 550°C Service
Chrome‑moly steel (WC6, WC9) is the standard material for high‑temperature steam and thermal oil systems, handling up to 550°C. Below are 2026 price references and key selection parameters.The main safety valve product names of China Safety Valve Network include:High Temperature and Pressure Fall Lift Safety Valve,Hydraulic Safety Valve,Impulse Safety Valve,Impulse Spring Safety Valve,JIS Safety Valve,Main Safety Valve,Overflow ValveOil Refining Specific Safety Valve,Pulse Safety Valve,Pilot Safety Valve,Pressure Safety Valve,Quick Switching Safety Valve,Spring Low Lift Safety Valve
2026 Price Reference (USD, ex‑works)
|
Material |
Size |
Pressure |
Connection |
Set Pressure |
Unit Price (USD) |
|
WC6 |
DN25 |
PN40 |
Flanged |
1.0–4.0 MPa |
250–360 |
|
WC6 |
DN40 |
PN40 |
Flanged |
1.0–4.0 MPa |
360–525 |
|
WC9 |
DN50 |
PN63 |
Flanged |
1.6–6.4 MPa |
580–800 |
|
WC9 |
DN80 |
PN63 |
Flanged |
1.6–6.4 MPa |
900–1220 |
Chrome‑moly costs 60–100% more than carbon steel WCB. Stellite hardfacing adds 15–20%; cooling fins add 10%.
Key Selection Parameters
Material – WC6 (1.25Cr-0.5Mo) up to 540°C; WC9 (2.25Cr-1Mo) up to 570°C. For 550°C, both work – WC9 is safer.
Lift type – Must be full‑lift (≥0.25d₀) for fast gas/steam relief.
Cooling fins – Required when media temperature exceeds 235°C to protect the spring.
Seat hardfacing – Stellite (cobalt‑based) for high‑temperature erosion resistance.
Set pressure – Spring stiffness changes at high temperature. Always use the manufacturer’s hot‑service correction factor for cold‑setting test pressure.
Flange standard – HG/T 20592 or GB/T 9113. Prefer MFM or TG facing for high‑temperature sealing.
Installation & Maintenance
Install vertically; keep outlet unobstructed.
Inlet pressure loss ≤3% of set pressure.
When hot‑bolting flanges, open the valve slightly before tightening.
Calibrate at least once a year – every 6 months for continuous high‑temperature service.
Bottom line: A DN40 WC6 safety valve costs $360–525. For 550°C, choose full‑lift + cooling fins + Stellite seat, and adjust set pressure using hot‑service correction. Correct material selection prevents high‑temperature failure.
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