How to check fit and access
Trial-fit, open and close through full travel, then remove and refit without contacting the stem or blocking the packing gland.
Open the example review drawing →
See inspection and acceptance checks →Steam & hot water
Removable gate valve insulation jackets
Cover the valve body and keep the rising stem and handwheel free to travel.
Boiler headers, campus steam mains and hot-water isolation valves.
Inside a three-layer valve jacket
Follow one section of the olive jacket from the outside cover down to the hot valve body.
- 1 · Outer cover
Silicone-coated glass cloth
Protects the insulation core from rubbing during routine handling. The coated cloth remains flexible enough to follow the valve body.
- 2 · Insulation core
Needled glass-fibre mat
Slows heat loss through the jacket. The flexible mat follows the curved body. Choose the core thickness for the target surface temperature and the space available.
- 3 · Hot-face liner
Woven glass cloth
Faces the hot valve and encloses the core. The woven fabric protects the mat during removal and refitting. Check the liner and sewing thread against the actual hot-face temperature.
Straps, seams and edges
The strap and metal D-ring secure the jacket. Bound edges and stitching keep the core enclosed. Release the straps from the working side and keep the stem and handwheel clear.
This is a construction example for dry steam service. Final materials, core thickness and assembly temperature limits are confirmed for the equipment and operating conditions.
Compare jacket materials by service →Product views and construction details
Compare alternate views and see how the jacket opens, fits or fastens.
Design and specifications
A separate bonnet section lets a technician lift the body cover away without trapping it under the rising stem.
- Shape and construction
- Split body and optional separate bonnet section
- Facing, core and hot face
- Silicone-coated glass-fibre outer face, needled glass-fibre core and woven glass hot face, subject to documented temperature limits.
- Nominal core thickness
- 25 / 40 / 50 mm nominal core options for dry hot service.
- Installation and closure
- Temperature-rated straps and stainless D-rings on the accessible side.
- Dimensions to confirm
- Valve tag and type, face-to-face length, flange OD, bonnet width and stem projection fully open.
These are options for a custom quotation. Confirm the assembled materials, dimensions, service limits and finish in writing.
Review the construction detail
coated textile, enclosed core and detachable fastening.
Compare the product views above ↑
Industry construction reference →
What to verify before approving a quote
Ask for a marked drawing showing full stem travel, handwheel clearance and access to the packing gland.
Request the facing, core and liner data sheets, the proposed core thickness and the operating conditions used for any surface-temperature estimate. The Thermaxx hot-jacket data sheet is a third-party example of how these conditions are stated.
Operating temperature and expected result
Set an outer-surface temperature or heat-loss target at the normal and peak valve surface temperatures. Include the seam and stem opening in the review.
Agree the conditions, measurement points and target for the proposed cover before quoting. Record the complete assembly’s approved service limits separately from the target outside-face temperature.
Compare thickness, surface temperature and heat loss →Dry steam and hot-water reference
Calculated outside-face temperature for Shannon LT450SS at 21.1 °C ambient, flat-surface model. The manufacturer lists a maximum service temperature of 232 °C for this model. The columns show its nominal insulation thicknesses in millimeters and the manufacturer’s approximate inch equivalents.
| Operating temperature | 25 mm (1 in) | 40 mm (1½ in) | 50 mm (2 in) |
|---|---|---|---|
| 121 °C | 37.9 °C | 33.3 °C | 30.8 °C |
| 177 °C | 47.3 °C | 40.3 °C | 36.3 °C |
| 232 °C | 57.2 °C | 47.8 °C | 42.3 °C |
These figures describe the cited manufacturer’s model. Shape, airflow, compression, gaps and closures affect the installed result. A lower outside-face temperature still needs to be checked against your site’s contact and inspection requirements.
Read the manufacturer’s data →What to send us
Send body length, flange OD, bonnet shape and fully open stem travel.
Include a drawing or scaled photos, quantity and delivery location. Once the key measurements are available, we can review a CAD drawing or annotated design together.
Equipment in the field
Use a site photo like this to show nearby pipework, access obstructions and service points. Send your own photos from two angles, with a scale reference in the same plane as the dimensions.
Prepare a photo set →
