---
product_id: 13332982
title: "Control Devices - ST25-1A200 ST Series Brass ASME Safety Valve, 200 psi Set Pressure, 1/4\" Male NPT"
brand: "control devices"
price: "R465"
currency: ZAR
in_stock: true
reviews_count: 8
category: "Control Devices"
url: https://www.desertcart.co.za/products/13332982-control-devices-st25-1a200-st-series-brass-asme-safety-valve
store_origin: ZA
region: South Africa
---

# 250°F max operating temperature 1/4" male NPT threaded inlet 200 psi preset relief pressure Control Devices - ST25-1A200 ST Series Brass ASME Safety Valve, 200 psi Set Pressure, 1/4" Male NPT

**Brand:** control devices
**Price:** R465
**Availability:** ✅ In Stock

## Summary

> ⚡ Stay ahead of pressure risks with precision-engineered safety!

## Quick Answers

- **What is this?** Control Devices - ST25-1A200 ST Series Brass ASME Safety Valve, 200 psi Set Pressure, 1/4" Male NPT by control devices
- **How much does it cost?** R465 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/13332982-control-devices-st25-1a200-st-series-brass-asme-safety-valve)

## Best For

- control devices enthusiasts

## Why This Product

- Trusted control devices brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **High Flow Capacity:** 178 CFM flow rate supports efficient pressure relief for low capacity air compressors and more.
- • **Certified Safety Assurance:** ASME safety rated with UV and NB marks guarantees compliance with top industry standards.
- • **Precision Pressure Control:** Relief pressure preset at 200 psi with ±3% accuracy ensures reliable system safety.
- • **Compact & Easy Installation:** 1/4" male NPT threaded inlet connection fits seamlessly into existing setups with minimal hassle.
- • **Durable Corrosion Resistance:** Brass body and stainless steel spring deliver long-lasting performance in harsh environments.

## Overview

The Control Devices ST25-1A200 is a brass ASME-certified safety valve preset to 200 psi, featuring a 1/4" male NPT inlet, stainless steel spring, and a 178 CFM flow rate. Designed for high durability and corrosion resistance, it operates safely up to 250°F and meets rigorous UV and NB certification standards, making it ideal for professional-grade pressure relief applications.

## Description

This Control Devices ST25-1A200 ASME safety valve has a brass body, a 200 psi relief pressure, a 1/4" male NPT threaded inlet connection, and a stainless steel pull ring for manual pressure relief. The valve's brass body, brass valve seat, and the zinc plated steel spring resist corrosion and can be used in operating temperatures up to 250 degrees F. The preset relief pressure is accurate to within +/- 3 percent and a silicon O-ring provides a leak-proof seal to within +/- 10 percent of the relief pressure. This safety valve is American Society of Mechanical Engineers (ASME) safety rated and displays the UV mark for pressure vessel safety valves. It also displays the NB mark for certification in accordance with NB-501, National Board Certification of Pressure Relief Devices. This safety valve has a 178 cubic feet per minute (CFM) flow rate and is suitable for low capacity pressure relief applications such as in home construction air compressors.Relief valves remove excess pressure or vacuum from a system. The valve openings allow fluids or gases to escape to decrease pressure, and then close once the valve reaches the reseating pressure limit. They also relieve excess vacuum by opening to release a gas into the system and then closing after it reaches its low-pressure limit. Some relief valves have an adjustment mechanism to set the pressure where the valve opens, making it suitable for various applications. Relief valves are rated according to the volume of liquid or gas that can flow through them and the material that the valve is constructed from must be suitable for the fluid or gas, which may be corrosive or at an extreme temperature, in which it operates. Relief valves are used in a variety of applications, such as air compressors, petrochemical and chemical manufacturing, natural gas processing, and power generation.Control Devices manufactures valves and other flow control devices. The company, founded in 1963, is headquartered in Fenton, MO.

Review: Big Steve - It works great
Review: psi - Good quality

## Features

- Relief pressure preset to 200 psi with flow rate of 178 cfm
- 1/4" male NPT threaded inlet connection
- Brass construction and stainless steel spring for corrosion resistance
- 250 degrees F maximum temperature for use in high temperature applications
- ASME safety rated with UV and NB marks

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0081TJKZI |
| Best Sellers Rank | #65,295 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #53 in Relief Valves |
| Brand | Control Devices |
| Date First Available | February 13, 2012 |
| Exterior Finish | Zinc Plated Steel |
| Inlet Connection Size | 0.25 Inches |
| Inlet Connection Type | National Pipe Tapered |
| Item Weight | 1.58 ounces |
| Item dimensions L x W x H | 5 x 1 x 1 inches |
| Item model number | ST25-1A200 |
| Manufacturer | Control Devices |
| Material | Brass |
| Maximum Operating Pressure | 200 Pound per Square Inch |
| National Stock Number | 4820-01-621-8959 |
| Number of Ports | 1 |
| Outlet Connection Size | 0.25 Inches |
| Outlet Connection Type | MNPT |
| Product Dimensions | 5 x 1 x 1 inches |
| UPC | 094700412393 |

## Product Details

- **Brand:** Control Devices
- **Exterior Finish:** Zinc Plated Steel
- **Inlet Connection Size:** 0.25 Inches
- **Inlet Connection Type:** National Pipe Tapered
- **Item dimensions L x W x H:** 5 x 1 x 1 inches
- **Material:** Brass
- **Maximum Operating Pressure:** 200 Pound per Square Inch
- **Number of Ports:** 1
- **Outlet Connection Size:** 0.25 Inches
- **Outlet Connection Type:** MNPT

## Images

![Control Devices - ST25-1A200 ST Series Brass ASME Safety Valve, 200 psi Set Pressure, 1/4" Male NPT - Image 1](https://m.media-amazon.com/images/I/41UvLMdZyFL.jpg)
![Control Devices - ST25-1A200 ST Series Brass ASME Safety Valve, 200 psi Set Pressure, 1/4" Male NPT - Image 2](https://m.media-amazon.com/images/I/61yZEnpyBvL.jpg)

## Questions & Answers

**Q: can this relief valve be used to drain water from the air tank**
A: Its' purpose is to relieve pressure - that's what it's designed for.I would not use it to drain water from a tank; it would likely corrode the components and compromise its' effectiveness.You will never find one of these on a compressor at the bottom of the tank - there's a drain there; it's always placed toward the top away from water build up.

**Q: Does it release right at 200psi because I have a 200psi pressure switch.**
A: If working properly the safety will blow at 200, if the safety valve psi is lower than the pressure switch set point it will blow before it reaches the set point, so the comp will never shut off, the safety valve should be about 30 lbs more than the pressure switch set point.
A 200 psi safety switch is common on a comp set to 165-175 psi.

**Q: What is the maximum negative temp that this valve will work with? For example -20c?**
A: I would not trust a $5 relief value without checking with the manufacture first.

**Q: if you want to reduce pressure mechanically through the relief valve , do you have to unthread the valve or is there a special action for that?**
A: No, you don't unthread the valve body. You just have to pull on the key ring. A spring keeps the valve closed; at the pressure the valve is rated for, the air pressure overcomes the spring force and allows the valve to open and relieve pressure. Pulling on the key ring hard enough allows you to overcome the spring force and open the valve; when you release the key ring, the spring should immediately close the valve.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Big Steve
*by B***E on February 19, 2025*

It works great

### ⭐⭐⭐⭐⭐ psi
*by J***Z on May 21, 2025*

Good quality

### ⭐⭐⭐⭐⭐ perfect fit
*by C***E on November 14, 2025*

Exact replacement for my Craftsman 175 max PSI, Pro (black) series upright air compressor.

## Frequently Bought Together

- Control Devices - ST25-1A200 ST Series Brass ASME Safety Valve, 200 psi Set Pressure, 1/4" Male NPT
- Performance Tool W10055 0-200 PSI Air Gauge for Air Tank Accessory
- Ingersoll-Rand Ingersoll Rand 23474653 Pressure Switch for Single Phase Compressor

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-02-19*