Brass Drain Cock Valve

A Brass Drain Cock Valve is a simple, typically quarter-turn or multi-turn shut-off valve designed primarily for draining fluid or air from a low point in a system, such as a water heater, boiler, radiator, or air tank. It’s built for reliability and ease of use in non-critical service.

📋 Technical Specifications

Parameter	Detail
Primary Function	Draining/Sampling (Fluid or Air)
Material Options	$\text{C}37700$ , $\text{MS}58$ ( $\text{CuZn}40\text{Pb}2$ ), $\text{CuZn}39\text{Pb}3$ , $\text{CW}602\text{N}$ , $\text{C}83600$ , $\text{C}84400$ , Lead-Free Brass
Sealing Material	$\text{EPDM}$ Washer (Ethylene Propylene Diene Monomer)
Connection Thread	$\text{NPT}, \text{BSP}, \text{BSPT}$ (Common pipe thread standards)
Pressure Rating	$\text{125 WOG}$ (Water, Oil, Gas at $125\,\text{psi}$ cold non-shock)
Size Range	$\text{1/2}''$ to $\text{3/4}''$

⭐ Material and Design Notes

Brass Construction: The wide variety of brass alloys listed ( $\text{C}37700$ , $\text{C}84400$ , etc.) are common choices for plumbing and general utility valves due to their excellent machinability, corrosion resistance to water, and durability.
Lead-Free Option: The availability of Lead-Free Brass ensures compliance with safe drinking water regulations (e.g., US Safe Drinking Water Act) when used in potable water systems.
$\text{EPDM}$ Sealing: The $\text{EPDM}$ washer provides a resilient seal, offering good resistance to heat, water, and steam, which is critical in heating system applications.
$\text{125 WOG}$ Rating: This is a low-pressure rating, suitable for common domestic, commercial, and light industrial applications (like residential boilers or air conditioning condensate pans).

🏭 Typical Applications

This type of valve is a standard utility component used for quick system drainage or access:

Boilers and Water Heaters: Installed at the bottom to flush sediment and drain the unit for maintenance.
Radiators and Hydronic Heating Systems: Used as a point to bleed air or drain sections of the piping.
Air Compressors: Used to drain condensate from the air receiver tank.
General Plumbing: Used in line systems as a localized low-point drain.