Kelly Cocks | Upper & Lower | AISI 4145H

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Product Overview

The DEENPU kelly cock is available in upper and lower models and provides quick, dependable closing to protect the swivel, standpipe, mud pumps and rotary hose against pressure surges, and to prevent drilling fluid loss when disconnecting the kelly.

The body is AISI 4145H heat treated to 285–341 BHN and manufactured to API Spec requirements. Each kelly cock ships with thread protectors and is pressure tested before delivery.

Key Features

• Upper and lower models for full kelly protection
• Quick ball-valve style closing
• AISI 4145H body, 285–341 BHN
• Manufactured per API Spec requirements
• Hydrostatically tested, thread protectors included

Technical Specifications

Dimensions & Technical Data

Kelly cock dimensions — upper and lower models

Quality & Testing

Every DEENPU Kelly Cocks is manufactured under our API-compliant quality system: raw material traceability, 100% dimensional inspection, hydrostatic pressure testing and hardness verification before packing. Material certificates, inspection reports and API documentation are provided with shipment on request.

Applications

• Kelly drilling strings — surge and backflow protection
• Pump and standpipe isolation
• Kelly disconnection without fluid loss

Frequently Asked Questions

Q: Upper or lower — which goes where?

A: The upper kelly cock sits above the kelly (below the swivel), the lower sits below the kelly — together they isolate the kelly from both directions.

Q: How is it operated?

A: Quarter-turn ball valve operated by a wrench or integrated handle; closing takes seconds under pressure.

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