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PN40 DN25 Spring Type Fire Protection Pressure Relief Valve

PN40 DN25 Spring Type Fire Protection Pressure Relief Valve

  • PN40 DN25 Spring Type Fire Protection Pressure Relief Valve
  • PN40 DN25 Spring Type Fire Protection Pressure Relief Valve
PN40 DN25 Spring Type Fire Protection Pressure Relief Valve
Product Details:
Place of Origin: China
Brand Name: TOBO
Certification: CE/ISO
Model Number: /
Payment & Shipping Terms:
Minimum Order Quantity: 1pc
Price: 1-100
Packaging Details: Inner package:plastic bag sealed package Outer package:carton package or wooden case package The lettering, nameplate, certificate for cryogenic valves are available We can customize the package for globe valve;
Delivery Time: 3-5 days
Payment Terms: D/A, D/P, T/T, Western Union, MoneyGram
Supply Ability: 3000pcs/month
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Detailed Product Description
Key Word1: Knife Gate Valve Port Size: DN50-DN300
Design Confirms:: GB12243/API526 MOQ: 1 - 9 Pieces
BODY: WCB Certificate: CE ISO9001
HS Code: 8481804090 Media: Water
Working Temperatu: -20~+425°C Actuator: Manual / Worm Gear
High Light:

DN25 Spring Safety Valve


PN40 Fire Protection Pressure Relief Valve


PN40 Fire Protection Relief Valve

PN40 DN25 Spring Type Fire Protection Pressure Relief Valve Safety Relief Valve


Adjustment of opening pressure:


① Before leaving the factory, the opening pressure of the safety valve should be adjusted one by one to the setting value required by the user. If the user proposes a spring working pressure level, it should generally be adjusted and shipped according to the lower limit value of the pressure level.


② Before installing the safety valve on the protected equipment or before installation, the user must readjust it at the installation site to ensure that the set pressure value of the safety valve meets the requirements.


③ Within the range of the spring working pressure level indicated on the nameplate, you can adjust the opening pressure by rotating the adjustment screw to change the spring compression.


④ Before rotating the adjusting screw, reduce the valve inlet pressure to less than 90% of the opening pressure to prevent the valve flap from being rotated when the adjusting screw is rotated, which may damage the sealing surface.


⑤ In order to ensure that the opening pressure value is accurate, the media conditions, such as media type and temperature, should be as close to the actual operating conditions as possible during adjustment. The type of medium changes, especially when the medium accumulation state is different (for example, from liquid phase to gas phase), and the opening pressure often changes. When the operating temperature increases, the opening pressure generally decreases. Therefore, when adjusted at normal temperature and used for high temperature, the set pressure value at normal temperature should be slightly higher than the required opening pressure value. How high is related to valve structure and material selection should be based on the manufacturer's instructions.


⑥ The conventional safety valve is used to fix the additional back pressure. When the opening pressure is adjusted after the inspection (the back pressure is atmospheric pressure at this time), the setting value should be the required opening pressure minus the additional back pressure.



Automatic valve Spring type stainless steel safety valve the relief valve No. Name
1 Cap
2 Adjust Screw
3 Nut
4 Spindle
5 Spring
6 Valve Body
7 Spring Seat
8 Disc
9 Gasket
10 Buffer
11 Gasket Ring
12 Valve Seat


Inlet D Outlet Lift L1 L2 H
1/2" 13 1/2" 0.52 31 48 135.5
3/4" 19 3/4" 0.76 35 55 144.5
1" 25 1" 1 39.5 65 175
1 1/4" 31.5 1 1/4" 1.28 50.5 75 197
1 1/2" 37 1 1/2" 1.52 59 86 223.5
2" 47 2" 2 67 100 257
Q1. Can I have a sample order for valve? A: Yes, we welcome sample order to test and check quality.Mixed samples are acceptable.
Q2. Do you have any MOQ limit for valve order? A: Low MOQ, 1pc for sample checking is available
Q3. How do you ship the goods and how long does it take to arrive? A: We usually ship by sea. It usually takes 30 days to arrive. Airline shipping also optional.
Q4. How to proceed an order for valve?

A: Firstly let us know your requirements or application. Secondly We quote according to your requirements or our suggestions.

Thirdly customer confirms the samples and places deposit for formal order.

Fourthly We arrange the production.


Q5: Are you products standard?

A: Our model is standard, if you have specific demand, pls tell us.
Q6: Do you have interest to do our own design items? A: Absolutely! We have big interest.

PN40 DN25 Spring Type Fire Protection Pressure Relief Valve 1PN40 DN25 Spring Type Fire Protection Pressure Relief Valve 2




Contact Details

Contact Person: Ellen

Tel: 15821287672

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