Die-Formed Graphite Rings

At Kriloha Ltd., we recognize that in high-pressure steam and chemical service, “Close Enough” is never good enough. A loose-fitting packing ring is a leak waiting to happen. The Kriloha Die-Formed Graphite Ring is engineered for “Dimensional Perfection.” As a premier global provider of industrial sealing solutions, Kriloha Gaskets has mastered the Hydraulic Compression technology required to turn flexible graphite ribbon into a high-density, structural sealing element.

The engineering of a Kriloha Die-Formed Ring is based on Radial Expansion. When the packing gland is tightened, the ring compresses axially and expands radially against the stem and the stuffing box wall. Because our rings are die-molded to the exact dimensions of your equipment, they provide an immediate, “Bubble-Tight” seal with minimal gland adjustment. At Kriloha, we often provide these as Split Rings (cut at a 45° angle) to allow for easy installation without needing to fully disassemble the valve.

Manufacturing these rings at Kriloha involves strict Weight-to-Volume Calibration. We ensure that every ring in a set has the exact same density to prevent “uneven loading,” which is the leading cause of premature packing failure. Whether you are sealing a high-pressure bypass valve or a critical feed-water pump, Kriloha Die-Formed Graphite Rings provide the mechanical stamina and thermal invincibility your facility demands. By choosing Kriloha Ltd., you are investing in a “Zero-Leakage” technology that simplifies maintenance and protects your most valuable assets.

Primary Use Cases

High-Pressure Steam Valves: The gold standard for sealing valve stems in power plants, refineries, and boiler houses.
Petrochemical Control Valves: Providing a fugitive emission-compliant seal for volatile organic compounds (VOCs).
Soot Blowers: Resisting the intense thermal cycling and abrasive environments found in boiler cleaning systems.
High-Temperature Pumps: Used as an end-ring or primary seal for pumps handling hot oils, heat transfer fluids, and chemicals.
Nuclear Power Infrastructure: Utilized in critical primary-loop valves where radiation resistance and long-term reliability are mandatory.

FAQs

Why use Die-Formed Rings instead of standard braided packing?

Die-formed rings are pre-compressed to their final density. This means they experience almost no “bedding-in” shrinkage, requiring far fewer gland adjustments and providing a much more reliable seal in high-pressure applications.

Are these rings available with metal reinforcement?

Yes. Kriloha offers die-formed rings with integrated Inconel or Stainless Steel wire reinforcement for extreme high-pressure applications where blowout resistance is a primary concern.

What is the “Sacrificial Anode” or Zinc Inhibitor option?

To prevent galvanic corrosion of stainless steel valve stems, Kriloha can treat these rings with a Zinc Powder inhibitor. This acts as a sacrificial anode, protecting your expensive valve hardware from pitting.

Can I install these myself, or do they require special tools?

They are designed for standard installation. However, because they are high-density, it is important to use a Packing Tamper to ensure each ring is seated firmly and squarely at the bottom of the stuffing box.

How do I specify the size for a Die-Formed Ring?

You need three precise measurements: the Stem Diameter (ID), the Stuffing Box Diameter (OD), and the Ring Height (H). Accuracy within 0.1mm is recommended for the best performance.