What makes the Krombach valve suitable for slurry and abrasive media?

The self-cleaning seat design removes sediments from the ball surface during each cycle. Combined with hard coatings rated up to 70 HRC, the valve resists wear from solid particles and suspensions.

How do I select the correct hard coating for my application?

Coating selection depends on media phase, pH value, temperature, and pressure. Acidic media (pH 0–7) typically require chrome/cobalt-based coatings, while alkaline media (pH 7–14) are better suited to nickel-based options. Contact our engineers for application-specific recommendations.

Is this valve suitable for fire-safe service?

Yes. The Krombach valve is available with a fire-safe body gasket and features metal-to-metal body contact, meeting fire-safe design requirements.

What emission standards does this valve meet?

The valve is designed to comply with TA-Luft and Shell SPE 77/312 fugitive emission requirements. Leak detection and purge ports are available for emission monitoring.

Can the valve be automated?

Yes. The valve includes a standard ISO 5211 actuator mounting interface, allowing direct mounting of pneumatic, electric, or hydraulic actuators.

CRANE CHEMPHARMA & ENERGY · BALL VALVES

Krombach Metal Seated Ball Valve KFO 1136 – Crane – Trunnion Mounted Industrial Ball Valve

Name: Krombach Metal Seated Ball Valve KFO 1136 – Crane – Trunnion Mounted Industrial Ball Valve
Brand: Crane ChemPharma & Energy

Crane Krombach metal seated ball valve for severe service. Trunnion design, fire-safe, self-cleaning. Ideal for refining, chemical, and power plants.

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Krombach Metal Seated Ball Valve Design Features

Overview

The Crane Krombach Metal Seated Ball Valve (Series KFO 1136) is a trunnion-mounted ball valve engineered for demanding industrial applications involving high temperatures, abrasive media, and corrosive fluids. Designed with over 25 years of development expertise, this valve features precision-machined ball and seat components that are freely interchangeable without individual lapping, simplifying maintenance and reducing spare parts inventory.

The valve incorporates a self-adjusting seat design using flexible graphite spring elements and Inconel cup springs to deliver consistent pre-load against the ball, ensuring bi-directional tight shutoff without relying on differential pressure. Its self-cleaning mechanism removes adhesive media and sediments during cycling, extending service life in slurry and particle-laden applications.

Compliant with ASME B16.34 and AD2000-A4 standards, the Krombach metal seated ball valve is available with fire-safe body gasket options and meets stringent emission control requirements including TA-Luft and Shell SPE 77/312. The polygon stem-to-ball connection reduces stress concentration while ensuring optimal torque transmission, and the blowout-proof stem design enhances operational safety.

Key Features

Trunnion-mounted ball design with polygon stem-to-ball connection for reduced stress and reliable torque transmission
Self-adjusting seat system with graphite spring elements and Inconel Belleville springs for thermal and dimensional compensation
Self-cleaning mechanism removes sediments and adhesive media during valve cycling
Fire-safe design with metal-to-metal body contact and fire-safe body gasket option
Interchangeable ball and seats — precision machined to eliminate individual lapping requirements
Low-emission stem sealing compliant with TA-Luft and Shell SPE 77/312
Self-relieving seat design for automatic cavity pressure venting
Actuator-ready with mounting interface per ISO 5211

Specifications

Parameter	Value
Design Standard	ASME B16.34, AD2000-A4
Pressure Class	Class 150 to Class 2500
Temperature Range	Up to 1500°F (depending on coating selection)
Ball Material	Stainless steel with wear-resistant hard coating
Coating Hardness	56–70 HRC (varies by coating type)
Coating Thickness	0.0025–0.032 inch
Body Design	Split body, metal-to-metal sealing
Stem Design	Blowout-proof with superfine surface finish
Actuator Mounting	ISO 5211
Emission Compliance	TA-Luft, Shell SPE 77/312
Leakage Class	API 598 and extended 60-minute test at 300 psig N₂ (Class VI)
Code	Base Material	Process	Thickness	Hardness (HRC)
H2	Chromium	Electro galvanic	0.003 inch	~70
H3	Nickel alloy	Plasma spray and fused	0.032 inch	56–58
H4	Nickel alloy + carbides	Plasma spray and fused	0.032 inch	60–62
H5	Cobalt alloy	Plasma spray and fused	0.032 inch	62–65
H6	Chrome-carbides	High-speed spraying	0.012 inch	65–70
H7	Ceramic chromoxide	Spraying	0.012 inch	>70

Applications

The Crane Krombach Metal Seated Ball Valve is suited for severe-service isolation duty across industries including:

- Oil & Gas – upstream and downstream isolation - Refining – high-temperature hydrocarbon service - Chemical Processing – corrosive and abrasive media - Power Generation – steam and high-temperature gas isolation - Mining – slurry and suspension handling - Pharmaceutical & Food – sanitary and clean process applications

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Frequently Asked Questions

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Contact PC Engineering for pricing, availability, and technical support for the Crane Krombach Metal Seated Ball Valve. Call us or fill in our inquiry form — our engineers will respond within 24 hours.

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