EMERSON Manuals Style HSL Safety Valves, Crosby-EN Manual
Summary
Ensure optimal reliability for high-pressure steam systems with Crosby Style HSL safety valves. This definitive manual provides expert instructions for installation, adjustment, and comprehensive maintenance of your unit. It details working with the advanced FLEXI-DISC design, specifying proper procedures for technicians and engineers in the power generation or industrial process industries. The guide covers material selection, spare parts identification, setup best practices, and adherence to required industry standards.
Page 1 Text Content
CROSBY STYLE HSL SAFETY VALVES INSTALLATION, MAINTENANCE AND ADJUSTMENT INSTRUCTIONS
Before installation, these instructions must be carefully read and understood
Style HSL safety valves incorporate the Crosby FLEXI-DISC® design which is recessed for pressure and temperature equalization ensuring a tight seal capable of containing system pressure at 94% of the valve set pressure. Seat tightness testing at the factory for Style HSL safety valves is conducted at 93% of set pressure. Centering of the disc through the low friction guide ensures the HSL opens precisely at set pressure, even after repeated cycling. The single bonnet design utilized in both inlet flange ratings allows set pressure changes without the need to change-out any components other than the spring. Style HSL safety valves are available with optional test gags, weather hoods for outdoor applications and Class 150# drip pan elbows. Ring type joint inlet connection is also available. The entire HSL range of F thru Q orifices uses a full nozzle design (Figure 1) to facilitate removal and ease of maintenance compared to semi-nozzle designs. 1 INTRODUCTION Details of the HSL valve design, materials of construction, pressure-temperature ratings Crosby Style HSL is a full nozzle reaction and dimensions are provided in Crosby type safety valve designed for saturated and technical datasheet VCTDS-00595.
superheated steam service. The design is suitable for set pressures to 725 psig (50 barg) 2 SPARE PARTS and temperatures to 1000°F (538°C), with high capacities, two choices of inlet flange ratings Emerson recommends spare parts as shown and simplicity of design to facilitate ease of on Figures 1 and 2. When ordering spare parts, maintenance. the valve size, style and serial number should The HSL design meets the requirements be given together with set pressure, part name, of ASME Code Section I, (power boilers) and reference number from Figure 1 or 2. and relieving capacities are certified by the Spare parts may be ordered from any Emerson National Board of Boiler and Pressure Vessel regional sales office or authorized Emerson Inspectors. Style HSL may also be used in sales representative. steam service applications covered by ASME code section VIII requirements.
Engineering doc. nr.: IS V3187
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Page Summary Contents For EMERSON Manuals Style HSL Safety Valves, Crosby-EN Manual
Manual Details
| Brand | Emerson |
|---|---|
| Pages | 11 |
| File Size | 1.15 MB |
| Published | June 06, 2026 |
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Frequently Asked Questions
What are the maximum operating temperature and pressure ratings?
The HSL design is suitable for set pressures up to 725 psig and temperatures up to 1000°F.
How does the valve accommodate changes in set pressure?
Due to its single bonnet design, set pressure can be changed only by replacing the spring.
At what percentage of set pressure is the seat tightness tested?
The factory seat tightness test for these valves is conducted at 93% of the set pressure.
What specific details must be provided when ordering spare parts?
You must provide the valve size, style, serial number, set pressure, and part name.