---
title: Hydraulic Valve Performance Test Stands and Clean Oil
description: "When a hydraulic valve manufacturer needed pristine fluids, they had to get serious about fluid handling best practices. Identifying three main problems: insufficient filtration, contaminated new oil and improper bottle sampling practices, Hy-Pro was able to implement best practices and new filtration that helped their fluid stay clean."
image: https://www.hyprofiltration.com/hubfs/Hydraulic_Valve-681780-edited-2.png
---

[![Donaldson Hy-Pro Logo_White](https://www.hyprofiltration.com/hs-fs/hubfs/Hy-Pro%20Logos/Donaldson%20Hy-Pro%20Logo_White.png?width=591&height=265&name=Donaldson%20Hy-Pro%20Logo_White.png)

![Donaldson Hy-Pro Logo 2](https://www.hyprofiltration.com/hs-fs/hubfs/Hy-Pro%20Logos/Donaldson%20Hy-Pro%20Logo%202.png?width=584&height=262&name=Donaldson%20Hy-Pro%20Logo%202.png) 

](https://www.hyprofiltration.com)

[**](https://www.hyprofiltration.com/blog/hydraulic-valve-performance-test-stands-clean-oil#tmpmodule_1568675152246189)

[![Distributors](https://no-cache.hubspot.com/cta/default/170326/6a993b6f-f737-4a22-8a35-a45c4da5c3b4.png)](https://cta-redirect.hubspot.com/cta/redirect/170326/6a993b6f-f737-4a22-8a35-a45c4da5c3b4)

![ECATALOG](https://no-cache.hubspot.com/cta/default/170326/interactive-162302555948.png)

**

###### 2 min read

### [Hydraulic Valve Performance Test Stands and Clean Oil](https://www.hyprofiltration.com/blog/hydraulic-valve-performance-test-stands-clean-oil)

 Tue, Nov. 29, 2016

- [Tweet](https://twitter.com/share)

## The Application

![hydraulic valve](https://www.hyprofiltration.com/hs-fs/hubfs/Hydraulic_Valve-681780-edited.png?width=231&height=176&name=Hydraulic_Valve-681780-edited.png "hydraulic valve")

A hydraulic valve manufacturer required pristine fluid (< 14/12/9) to test flow across an 80-micron orifice on their test stand. Gross amounts of contamination in the fluid would skew the test results, invalidating any data collected.

The system held 100 l (26.4 gal) of ISO VG 32 fluid with a flow rate of 25 lpm (6.6 gpm).Through observing the manufacturer’s sampling practices, discussing fluid handling best practices and interpreting their lab reports, three independent problems were identified: 

#### 1. Insufficient Filtration

The current 12µ filter had allowed the ISO code to elevate to 19/18/16 (4388 / 2413 / 610).

#### 2. New Oil ≠ Clean Oil

New oil was believed to be clean oil and it was not being conditioned when added to their system. [New oil is not clean oil](https://www.hyprofiltration.com/blog/bid/281371/how-clean-is-new-oil-part-1), in our experience, it usually has an ISO code around 25/22/19 (304,800 / 381,000 / 4763).

## 3. Bottle Sampling Practices

Observing the manufacturer’s sample collection procedures (after the filtration upgrade) revealed that the samples were being contaminated through improper valve and bottle flushing due to not follow [best sample collection practices](https://www.hyprofiltration.com/blog/proper-bottle-sampling-technique-for-reliable-trend-analysis).

## The Solution

Opportunities to improve fluid handling/sampling practices were identified and the onboard filtration was upgraded from a 12µ filter to a 1µ filter element (HP52NL10-1MB).

## The Results

![4m.png](https://www.hyprofiltration.com/hs-fs/hubfs/4m.png?width=365&name=4m.png)

Online particle counts showed ISO codes had been reduced to 14/11/0 (127 / 16 / 0) which represented a 96.8% reduction in particles > 4µ in size and enabled the manufacturer to complete the testing of their new valve.

[![Plastic Molding Injection Case Study](https://no-cache.hubspot.com/cta/default/170326/7d93a6b5-8222-41b2-a5e0-4826a36c9911.png)](https://cta-redirect.hubspot.com/cta/redirect/170326/7d93a6b5-8222-41b2-a5e0-4826a36c9911)

---

 

###### Topics: [ISO 4406](https://www.hyprofiltration.com/blog/topic/iso-4406) [hydraulic valve](https://www.hyprofiltration.com/blog/topic/hydraulic-valve) [samples](https://www.hyprofiltration.com/blog/topic/samples) [hydraulic oil](https://www.hyprofiltration.com/blog/topic/hydraulic-oil)

#### Written by [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing)

###### [** Previous Post](https://www.hyprofiltration.com/blog/fluid-analysis-reference-guide)

[![Hy-Pro Filtration fluid analysis test reports ](https://via.placeholder.com/300x150.jpg/e0e7ee)](https://www.hyprofiltration.com/blog/fluid-analysis-reference-guide)

###### [Fluid Analysis Reference Guide](https://www.hyprofiltration.com/blog/fluid-analysis-reference-guide)

###### [Next Post **](https://www.hyprofiltration.com/blog/hydraulic-pump-reliability)

[![Hydraulic-Pump.jpg](https://via.placeholder.com/300x150.jpg/e0e7ee)](https://www.hyprofiltration.com/blog/hydraulic-pump-reliability)

###### [When a Pump Fails, the Whole System Fails: Hydraulic Pump Reliability](https://www.hyprofiltration.com/blog/hydraulic-pump-reliability)

### Featured

### Sign up for updates

## Have a Question for Donaldson Hy-Pro?

[![Contact Us](https://no-cache.hubspot.com/cta/default/170326/82b6a151-2481-4e91-9cac-0d88a5679d18.png)](https://cta-redirect.hubspot.com/cta/redirect/170326/82b6a151-2481-4e91-9cac-0d88a5679d18)

[**](https://www.linkedin.com/company/hy-pro-filtration) [**](https://www.youtube.com/c/hyprofiltration)

[![Donaldson Hy-Pro Logo](https://www.hyprofiltration.com/hs-fs/hubfs/Hy-Pro%20Logos/Donaldson%20Hy-Pro%20Logo%202.png?width=130&height=58&name=Donaldson%20Hy-Pro%20Logo%202.png "Donaldson Hy-Pro Logo")](https://www.hyprofiltration.com)

Donaldson Hy-Pro 6810 Layton Road Anderson IN, 46011 | +1 (317) 849-3535 | info@hyprofiltration.com | All Rights Reserved 2026

**

```json
{
  "@context" : "https://schema.org",
  "@type" : "BlogPosting",
  "author" : {
    "@type" : "Person",
    "name" : "Hy-Pro Marketing",
    "url" : "https://www.hyprofiltration.com/blog/author/hy-pro-marketing"
  },
  "dateModified" : "2023-08-09T20:17:47.629Z",
  "datePublished" : "2016-11-29T15:12:00.000Z",
  "headline" : "Hydraulic Valve Performance Test Stands and Clean Oil",
  "image" : [ "https://www.hyprofiltration.com/hubfs/Hydraulic_Valve-681780-edited-2.png" ],
  "mainEntityOfPage" : {
    "@id" : "https://www.hyprofiltration.com/blog/hydraulic-valve-performance-test-stands-clean-oil",
    "@type" : "WebPage"
  },
  "publisher" : {
    "@type" : "Organization",
    "logo" : {
      "@type" : "ImageObject",
      "url" : "https://www.hyprofiltration.com/hubfs/Hy-Pro%20Logos/Donaldson%20Hy-Pro%20Logo%202.png"
    },
    "name" : "Donaldson Hy-Pro"
  }
}
```