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Crosby H Series Direct Spring Safety Valves Boiler Steam Safety Valve Full Nozzle Flanged Safety Valve

1
MOQ
US $999.00 - 1500.00/ Set
Price
Crosby H Series Direct Spring Safety Valves  Boiler Steam Safety Valve Full Nozzle Flanged Safety Valve
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Features
Specifications
Style: Relief Valves
Connections: Full Nozzle Flanged Option
Model Number: HE /HCI /HSJ /HSL /HCA
Application: Boiler And Pressure Vessel
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Crosby H Series safety valve

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flanged boiler safety valve

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steam safety valve full nozzle

Basic Infomation
Brand Name: Crosby
Model Number: H Series
Payment & Shipping Terms
Packaging Details: Wooden box + protection
Delivery Time: 60-80 work days
Payment Terms: T/T
Supply Ability: 1000 sets per year
Product Description
Crosby H Series Direct Spring Safety Valve
Product Overview

The Crosby H Series Direct Spring Safety Valves are engineered to deliver reliable and robust overpressure protection for steam applications in industrial settings. Designed to meet ASME Boiler and Pressure Vessel Code Section I and Section VIII requirements, these valves offer exceptional performance for steam drums, superheaters, and economizers. With features like ISOFLEX seat technology for up to 93% tightness and a full nozzle flanged option, the H Series ensures long service life, low maintenance, and compliance with global safety standards, making it a trusted choice for power generation and industrial boiler systems.

Key Features
  • ASME Certified: Certified for steam under ASME/NB Section I and VIII standards.
  • ISOFLEX Seat Technology: Ensures tightness up to 93% of set pressure (consult factory for >93%).
  • Full Nozzle Flanged Option: Enhances durability and simplifies installation.
  • Restricted Lift Capability: Allows customized capacity for specific applications.
  • Two-Ring Control: Provides precise set pressure and blowdown adjustments.
  • Long Service Life: Robust design minimizes wear and maintenance needs.
  • Low Maintenance: Self-draining design reduces corrosion and residue buildup.
  • High Reliability: Set and tested on steam for consistent performance.
Technical Specifications
Parameter Specification
Sizes 1¼” F 1½” to 6” RR 10”
Orifice Sizes 0.307 to 19.29 in² (1.98 to 124.45 cm²)
Set Pressure Range 15 to 6200 psig (1 to 427 barg)
Temperature Range Up to 1130°F (610°C)
Connections Flanged or welded inlet
Body Materials Carbon steel, stainless steel, alloy materials
Seat Tightness Up to 93% (ISOFLEX, consult factory for higher tightness)
Load Type Direct spring-loaded
Certifications ASME Section I (V Designator), Section VIII (UV Designator), NB certified
Applications

The Crosby H Series valves are designed for critical steam safety applications:

  • Power Generation: Protects steam drums, superheaters, and reheaters in boilers.
  • Industrial Boilers: Ensures safety in high-pressure steam systems.
  • Chemical Processing: Safeguards steam-based processes in chemical plants.
  • Oil and Gas: Provides overpressure protection in steam-related operations.
  • Marine Systems: Supports steam safety in shipbuilding applications.
Frequently Asked Questions
What makes the Crosby H Series suitable for steam applications?

Its ASME/NB certification, ISOFLEX seat technology, and full nozzle design ensure reliable performance for steam systems.

Can the H Series be customized for specific capacities?

Yes, the restricted lift option allows tailored capacity for specific applications.

What certifications do these valves hold?

They are certified to ASME Section I (V Designator), Section VIII (UV Designator), and NB standards.

How does the ISOFLEX seat benefit the valve?

It provides up to 93% tightness of set pressure, reducing leakage and enhancing safety.

Are these valves low maintenance?

Yes, the self-draining design and robust construction minimize maintenance needs.

Contact Us

For more information about the Crosby H Series Safety Valves, pricing, or to request a demo, contact our team:

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Ratings & Review

Overall Rating

5.0
Based on 50 reviews for this supplier

Rating Snapshot

The following is the distribution of all ratings
5 stars
100%
4 stars
0%
3 stars
0%
2 stars
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1 stars
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All Reviews

D
Daulet Nurgazin
Kazakhstan Mar 19.2026
I purchased the Flowserve 3821 and am very satisfied with the overall transaction. The item arrived in good condition, matched the specifications accurately, and performed as expected. The seller demonstrated strong professionalism, provided a reasonable price, and ensured the delivery schedule was met. A dependable supplier that I would confidently work with again.
Y
Yusup Komarudin
Indonesia Oct 8.2025
We purchased several AUMA for our power plant maintenance. The quality is reliable, and their team gave us very clear technical guidance.
L
leyla kh
United Arab Emirates Sep 12.2025
We purchased 20 units of valve positioners for a refinery project in UAE. Delivery was fast and technical support was very professional.
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Get in touch with us
Contact Person : Mr. Edward Zhao
Tel : +8615000725058
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