What is the difference between DP143 and DP143H?

The standard DP143 is rated for steam service up to 300°C, while the DP143H is the high-temperature version designed for applications up to 350°C at 26 bar g. Select DP143H when your process operates above 300°C.

Is this valve IBR approved for use in India?

Yes, the DP143 and DP143H fully comply with the Indian Boiler Regulations (IBR), 1950, and are suitable for IBR-certified steam installations.

How do I select the correct pressure adjustment spring?

Three colour-coded springs are available — Red (0.2–17 bar g) for general applications, Grey (16–24 bar g) for higher downstream pressures, and Yellow (0.2–3 bar g) for low-pressure precision control. Select based on your required downstream pressure range.

Can I use this valve with an external sensing line?

Yes, external pressure sensing is recommended for optimal accuracy. Using only the internal balance pipe can reduce valve capacity by up to 30%, particularly at low downstream pressures.

What spare parts are available for maintenance?

Spirax Sarco offers a comprehensive maintenance kit including main and pilot diaphragms, pilot valve and plunger assembly, main valve assembly, body gaskets, and fastener sets. Contact PC Engineering for genuine spare parts.

SPIRAX SARCO · PRESSURE REDUCING VALVES

Spirax Sarco DP143 / DP143H Pilot Operated Pressure Reducing Valve - Cast Steel Body - IBR Certified

Name: Spirax Sarco DP143 / DP143H Pilot Operated Pressure Reducing Valve - Cast Steel Body - IBR Certified
Brand: Spirax Sarco

Spirax Sarco DP143 pilot operated PRV for steam pressure reduction. IBR certified, cast steel body, DN15-DN80. Get quote from PC Engineering India.

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Overview

The Spirax Sarco DP143 and DP143H are pilot operated pressure reducing valves designed for accurate downstream pressure control in steam systems. Constructed with cast steel bodies (GP240GH +N), these valves are built for demanding industrial environments where reliable pressure reduction is critical for process efficiency and equipment protection.

The DP143 is suitable for standard steam applications up to 300°C, while the DP143H high-temperature variant handles temperatures up to 350°C. The pilot operated design ensures precise pressure regulation even under fluctuating load conditions, making these valves ideal for process steam supply, heating systems, and industrial plant utilities.

Both models comply fully with the Indian Boiler Regulations (IBR), 1950, making them suitable for use in IBR-certified installations across Indian manufacturing facilities.

Key Features

Pilot operated design for accurate and stable downstream pressure control
Cast steel body construction (GP240GH +N) for high-pressure industrial service
IBR certified — complies with Indian Boiler Regulations, 1950
High-temperature version available — DP143H rated up to 350°C
Wide size range — DN15LC to DN80 with ASME 150, ASME 300, and BS 10 Table J flange options
Three interchangeable pressure adjustment springs for flexible downstream pressure ranges (0.2–3 bar, 0.2–17 bar, 16–24 bar)
Stainless steel internals (AISI 316/431) for corrosion resistance and durability
Internal strainer fitted to protect pilot valve assembly

Specifications

Parameter	Value
Valve Type	Pilot Operated Pressure Reducing Valve
Body Material	Cast Steel GP240GH +N
Sizes Available	DN15LC, DN15, DN20, DN25, DN32, DN40, DN50, DN80
Flange Standards	ASME 150, ASME 300, BS 10 Table J
Body Design Pressure (PN)	PN40
Max. Upstream Pressure (ASME 150)	14 bar g
Max. Upstream Pressure (ASME 300)	26 bar g
Max. Operating Temp. (DP143)	300°C @ 26 bar g
Max. Operating Temp. (DP143H)	350°C @ 26 bar g
Min. Operating Temperature	0°C
Max. Differential Pressure	14 bar (ASME 150) / 26 bar (ASME 300)
Downstream Pressure Range (Red Spring)	0.2–17 bar g
Downstream Pressure Range (Grey Spring)	16–24 bar g
Downstream Pressure Range (Yellow Spring)	0.2–3 bar g (precision control)
Diaphragm / Internals Material	Stainless Steel AISI 316 / AISI 431
Certification	Indian Boiler Regulations (IBR), 1950
Size	DN15LC	DN15	DN20	DN25	DN32	DN40	DN50	DN80
Kv	1.0	2.8	5.5	8.1	12.0	17.0	28.0	64.0

Applications

- Process steam supply — precise pressure control for manufacturing processes - Power plants and utilities — pressure reduction stations for steam distribution - Pharmaceutical and chemical plants — regulated steam supply for reactors and heating - Textile and paper mills — consistent steam pressure for dryers and calenders - Food and beverage processing — hygienic steam applications requiring accurate control - HVAC and district heating systems — pressure regulation for building services

Frequently Asked Questions

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Contact PC Engineering for pricing, availability, and technical support for Spirax Sarco DP143 / DP143H Pilot Operated Pressure Reducing Valves.

Call us or fill in our inquiry form — our engineers will respond within 24 hours.

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