25P pilot valve type pressure reducing valve
Pilot valve type Spirax Sarco 25P pressure reducing valve is widely used in steam system, which can realize accurate and stable pressure control regardless of the change of upstream steam pressure or fluctuation of downstream load.

One of the outstanding features of the Spirax Sarco 25 pressure reducing valve is the installation or interchange of one or more pilot valves on the same valve body. In the stable decompression colleagues, you can achieve temperature control, upstream pressure control and remote switch control. Wait. These function-changing valves can either be supplied at the time of delivery or simply assembled on site.

Some products and services are only available in certain regions.

Working principle of Spirax Sarco 25P pressure reducing valve
The normal position of the 25p pressure reducing valve before starting is that the main valve is closed, and the pilot valve is opened by the spring force. The steam enters the main diaphragm chamber through the pilot valve, and a part of the steam flows out through the control hole. When the steam flowing in from the pilot valve is larger than the steam flowing out of the control hole, the control pressure in the main diaphragm chamber increases, and the main valve is opened. As the steam flows through the main valve of the 25 pressure reducing valve, the increase in downstream pressure acts on the lower part of the pilot diaphragm via the feedback of the induction tube. This force balances the spring compression force on the upper part of the diaphragm, so that the 25P pilot valve gradually closes and throttles. Maintain the pressure in the main diaphragm chamber and control the opening of the main valve to deliver an appropriate amount of steam. Adjust the spring on the diaphragm of the 25P pilot valve to change the set pressure downstream. When steam is not needed, the pressure of the induction tube increases, and the pilot valve is closed, and the control pressure is released from the control hole, so that the main valve is tightly closed.

Selection of Spirax Sarco 25P pressure reducing valve
How to choose 25p pressure reducing valve?
1. Determine the upstream steam P1 (barg), the set downstream steam pressure P2 (barg), and the maximum steam flow kg / h;
2. Determine the caliber of the pressure reducing valve from the following selection diagram;
3. Determine the material and connection method of the valve body.
For example
The following two examples of saturating steam and superheated steam are used to explain how to use this flow chart.
Saturated Vapor
The flow rate is 5000kg / h, the upstream pressure is 8barg, and the pressure is reduced to 5barg.
From the intersection of 5barg of downstream pressure and the curve of 8barg of upstream pressure as the horizontal line, from the intersection point downwards, we can see that the flow rate of the 3 "(DN80) pressure reducing valve is 5900kg / h, which is the smallest 25p pressure reducing valve.
superheated steam
Because the specific volume of superheated steam is high, the data in the selection chart of the Spirax Sarco 25p pressure reducing valve needs to be corrected.
The correction factor for superheat degree is 55 ° C is 0.95, and the correction factor for superheat degree is 100 ° C is 0.9.
So for a 3 "pressure reducing valve, if the steam superheat is 55 ° C, the flow rate is 5900 * 0.95 = 5600kg / h, which can still meet the requirements.

Order process
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Receive customer purchase list, provide customers with valve model selection and quotation (price list).
Specific agreement: delivery time, special requirements, etc.
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Customers have special requirements for products, and must provide the following instructions in the order contract:
(1) Structure length;
(2) Connection form;
(3) Nominal diameter, full diameter, reduced diameter, pipe size;
(4) Operating medium, temperature and pressure range;
(5) Experiment, inspection standards and other requirements;
(6) Various driving devices can be configured in this field according to the special requirements of customers;
If the determined valve type and model are provided by the customer, the customer should correctly explain the meaning and requirements of its model, and sign the contract under the conditions that the supply and demand sides understand and agree.