---
product_id: 104302452
title: "Control Devices ST25-1A300 ST Series Brass Soft Seat ASME Safety Valve, 300 psi Set Pressure, 1/4 Male NPT"
brand: "control devices"
price: "$85"
currency: NZD
in_stock: true
reviews_count: 2
url: https://www.desertcart.nz/products/104302452-control-devices-st25-1a300-st-series-brass-soft-seat-asme
store_origin: NZ
region: New Zealand
---

# 250°F max operating temp 1/4" Male NPT Vibra-Seal thread 300 psi preset pressure Control Devices ST25-1A300 ST Series Brass Soft Seat ASME Safety Valve, 300 psi Set Pressure, 1/4 Male NPT

**Brand:** control devices
**Price:** $85
**Availability:** ✅ In Stock

## Summary

> ⚡ Safety that’s built to last — pressure relief perfected.

## Quick Answers

- **What is this?** Control Devices ST25-1A300 ST Series Brass Soft Seat ASME Safety Valve, 300 psi Set Pressure, 1/4 Male NPT by control devices
- **How much does it cost?** $85 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/104302452-control-devices-st25-1a300-st-series-brass-soft-seat-asme)

## 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-Temp Ready:** Operates safely up to 250°F, perfect for demanding industrial environments.
- • **Robust Brass Build:** Durable brass body paired with corrosion-resistant music wire spring for longevity.
- • **Secure Thread Lock:** 1/4" Male NPT inlet with Vibra-Seal thread lock prevents leaks and vibration loosening.
- • **Certified Safety Assurance:** ASME safety rated with UV and NB marks for trusted compliance and peace of mind.
- • **Precision Pressure Control:** Preset relief at 300 psi ensures reliable, consistent safety performance.

## Overview

The Control Devices ST25-1A300 is a brass soft seat safety valve preset to 300 psi, featuring a 1/4" Male NPT inlet with Vibra-Seal thread lock for leak prevention. It supports flow rates up to 262 cfm and operates safely at temperatures up to 250°F. ASME safety rated with UV and NB certifications, it delivers reliable pressure relief in high-temperature industrial applications.

## Description

Control Devices ST25-1A300 ST Series Brass Soft Seat ASME Safety Valve, 300 psi Set Pressure, 1/4 Male NPT

## Features

- Relief pressure preset to 300 psi with flow rate of 262 cfm
- 1/4 NPT threaded inlet connection with Vibra-Seal thread lock
- Brass construction and music wire spring for corrosion resistance
- 250 F maximum temperature for use in high temperature applications
- ASME safety rated with UV and NB marks

## Product Details

- **Material:** Brass
- **Brand:** Control Devices
- **Exterior Finish:** Stainless Steel,Steel,Zinc
- **Inlet Connection Size:** 0.25 Inches
- **Inlet Connection Type:** NPT thread
- **Outlet Connection Type:** MNPT
- **Maximum Operating Pressure:** 3E+2 Pound per Square Inch
- **Number of Ports:** 2
- **Outlet Connection Size:** 0.25 Inches
- **Specification Met:** asme

## Images

![Control Devices ST25-1A300 ST Series Brass Soft Seat ASME Safety Valve, 300 psi Set Pressure, 1/4 Male NPT - Image 1](https://m.media-amazon.com/images/I/61fS7rxX8yL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Will hold up to its standards
*by M***. on October 25, 2020*

Heavy duty

### ⭐⭐⭐⭐⭐ Received item as described quickly and evonomically
*by W***N on August 12, 2022*

Received item as described quickly and evonomically

## Frequently Bought Together

- Control Devices ST25-1A300 ST Series Brass Soft Seat ASME Safety Valve, 300 psi Set Pressure, 1/4 Male NPT
- Control Devices ST25-1A250 ST Series Brass Soft Seat ASME Safety Valve, 250 psi Set Pressure, 1/4 Male NPT
- SENCTRL 0-300 Psi Glycerin Liquid Filled Pressure Gauge, 2.5" Dial Size, 1/4" NPT Lower Mount, Stainless Steel Case, for Air Gas Water Oil Hydraulic Pressure Test

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**Shop now:** [https://www.desertcart.nz/products/104302452-control-devices-st25-1a300-st-series-brass-soft-seat-asme](https://www.desertcart.nz/products/104302452-control-devices-st25-1a300-st-series-brass-soft-seat-asme)

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-01-27*