Are You Using the Right Type?
If you work anywhere near industrial valves — whether you’re in oil and gas, pipeline operations, or heavy manufacturing — you’ve probably heard the term “body fill.” But unless you’ve had to specify or source it yourself, there’s a good chance you’ve never stopped to ask: what exactly does it do, and does it matter which one I use?
The short answer is yes, it matters a lot. The right body fill keeps your valves protected, operational, and corrosion-free. The wrong one — or none at all — can lead to seized gates, corroded internals, and expensive valve failures. This guide breaks down what body fill grease is, why it’s used, and how to choose the right formula for your specific operating conditions.
What Is Valve Body Fill Grease?
Gate valves — the kind used extensively in pipelines, oil and gas processing, and industrial fluid systems — have a hollow internal cavity that houses the gate mechanism. When a valve is manufactured, tested, or taken out of service for storage or shipping, that cavity is exposed to moisture. Water can enter through the test medium during hydrostatic testing, through condensation during storage, or simply from environmental exposure on a job site.
Left untreated, that moisture creates the conditions for corrosion, which can degrade internal metal surfaces, damage seals, and compromise the valve’s ability to operate when it’s needed most.
Body fill grease is the solution. It’s a heavy-bodied lubricant grease that is pumped or injected directly into the valve body cavity. Once inside, it does several things simultaneously:
- Displaces water and contaminants — pushing moisture out of the cavity before it can cause damage
- Coats and adheres to metal surfaces — creating a protective barrier against corrosion
- Lubricates the gate and stem interface — reducing wear on the threads as the gate moves in and out of the body
- Seals the cavity — maintaining protection during storage, transport, and field standby
Think of it like winterizing a pipe — you’re filling a vulnerable space with something that actively resists the elements, so that when you need that valve to perform, it’s ready.
When Should You Use Body Fill?
Body fill is most commonly applied in three situations:
1. After hydrostatic testing. Valves are pressure-tested with water before they’re shipped or installed. That test water needs to be removed and the cavity protected before the valve goes into storage or onto a truck. Applying body fill at this stage is standard practice in valve manufacturing and refurbishment.
2. Before storage or long-term layup. If a valve is going to sit in a warehouse, a yard, or on a shelf for any extended period, body fill prevents corrosion from developing while it waits. This is especially important in humid or coastal environments where ambient moisture is a constant threat.
3. Field maintenance and valve greasing. In active operations — particularly in oil and gas — valves may need to be re-lubricated and re-sealed as part of routine maintenance. In sour gas or high-H2S environments, body fill with specific corrosion inhibitors is critical to preventing chemical attack on the valve internals.
The DESCO Body Fill Line: Three Formulas Explained
Not all body fills are created equal. The conditions a valve faces during storage in a Houston warehouse are very different from those at a frac site in northern Alberta at -50°F. GRM Flow Products carries three formulas in the DESCO body fill line, each engineered for a specific set of operating conditions.
Here’s how to think about which one is right for your application.
DESCO 960 — The Standard Formula
Best for: General-purpose valve protection, post-hydrostatic testing, storage and shipping in moderate climates.
DESCO 960 is the foundational product in the line — an economical, heavy-duty mineral oil-based grease that has earned its place as a go-to body fill for valve manufacturers and service operations alike. It’s formulated with an antioxidant and corrosion inhibitor additive package and carries an unusually high specific gravity of 1.5, which means it’s dense, heavy-bodied, and clings tenaciously to metal surfaces.
Its NLGI Grade 2 consistency makes it easy to pump into cavities, and its dropping point above 500°F ensures it won’t break down or thin out under heat. The operating temperature range of 0°F to 300°F covers the vast majority of standard storage and field conditions in temperate climates.
If your valves are being tested, stored, or shipped in environments where freezing temperatures aren’t a primary concern, DESCO 960 is your workhorse.
DESCO 960 Arctic — Extended Temperature Protection
Best for: Cold-climate storage, northern field sites, valves exposed to outdoor conditions in winter environments.
DESCO 960 Arctic takes the proven chemistry of the standard 960 formula and expands its capabilities significantly. The base oil pour point drops to -10°F (-23°C), and recent formulation enhancements have improved both metal adherence and resistance across a much wider temperature range — from -40°F all the way up to 350°F.
Where the Arctic formula really distinguishes itself is in its addition of graphite as a solid lubricant. Graphite provides enhanced lubricity at the gate/stem interface and helps protect threads from galling and wear — a valuable upgrade when valves are being cycled in cold conditions where grease alone may not provide sufficient film strength.
DESCO 960 Arctic is still mineral oil-based, which keeps it economical, but its enhanced formulation makes it the right choice when you know a valve is heading into cold storage, a northern yard, or a field environment where winter temperatures are the norm.
If your operations are in Canada, the northern U.S., or any region where cold snaps are a regular part of the calendar, DESCO 960 Arctic is the smarter choice over the standard formula.
DESCO M50P — Extreme Cold, Sour Service
Best for: Sub -40°F field environments, H2S / sour gas applications, and any application where pumpability in extreme cold is non-negotiable.
DESCO M50P is in a different category altogether. Where the 960 and 960 Arctic are mineral oil-based, M50P is built on a synthetic blend base oil with a pour point of -78°F (-61°C) — that’s not a typo. This formula was specifically designed and tested for pumpability at temperatures below -50°F, which is critical in remote northern field environments where equipment needs to function even in brutal winter conditions.
Standard greases become stiff and unpumpable in extreme cold. M50P doesn’t. It was engineered to flow and lubricate even when the temperature drops well past the point where other products fail.
It’s available in pails, kegs, and 400-lb drums with liner, and its NLGI Grade 3 consistency provides a slightly firmer structure than the Grade 2 products — appropriate for the high-stress environments it’s designed for.
If your valves are operating in cold-weather, sour gas service, or any low-temperature environment where performance can’t be compromised, DESCO M50P is the only product in this line built for the job.
Choosing the Right Body Fill
Valve body fill might not be the most glamorous product in your supply catalog, but it plays a real role in protecting capital equipment and avoiding preventable failures. The difference between applying the right body fill and leaving a valve cavity unprotected — or using a formula that solidifies before it can be pumped — can mean the difference between a valve that’s ready to perform and one that’s already compromised.
The DESCO line gives you a formula for every scenario: a reliable standard for everyday use, an enhanced cold-weather option for northern and outdoor storage, and an extreme-duty Arctic-grade product for the toughest environments in the field.
Not sure which formula is right for your application? Contact the team at GRM Flow Products at sales@grmflow.com or call (780) 416-4823. Download technical data sheets for all three products at grmflow.com.