What is the difference between Class 1 and Class 2 gate valves as per IS 778?

Class 2 valves have higher pressure ratings (2.4 MPa shell, 1.6 MPa seat) compared to Class 1 (1.5 MPa shell, 1.0 MPa seat). Select Class 2 for higher working pressure requirements.

Can these valves be used for steam service?

Models 1006 and 1007 are rated up to 225°C and may be used for low-pressure steam. The IS 778 Class 1/2 models (1035 series) are rated only up to 45°C and are not suitable for steam.

What is the advantage of rising stem over non-rising stem design?

Rising stem valves provide visual indication of valve position (open/close) and keep the stem threads outside the media, reducing wear. Non-rising stem valves are more compact and suited for space-constrained installations.

Are open-shut indicator and locking device options available?

Yes, models 1035 and 1035A are available with open-shut indicator and locking device at nominal extra cost.

Can the gland packing be replaced without shutting down the line?

The IS 778 Class 1 and Class 2 models (1035, 1035A, 1035B, 1035C) have provision for repacking under pressure, allowing maintenance without full system isolation.

ZOLOTO · GATE VALVES

Zoloto Bronze Gate Valves – Screwed End, Non-Rising & Rising Stem (IS 778 / BS EN 12288)

Name: Zoloto Bronze Gate Valves – Screwed End, Non-Rising & Rising Stem (IS 778 / BS EN 12288)
Brand: Zoloto

Zoloto bronze gate valves for water & oil - screwed ends, PTFE packing, Class 1 & 2 ratings. Sizes 1/4" to 4". Buy from PC Engineering India.

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Overview

Zoloto bronze gate valves are designed for isolation duty in water and oil service applications across industrial plants. These valves feature a robust bronze body (IS 318 Gr. LTB 2) with forged brass internals, providing reliable shutoff performance and extended service life in demanding environments.

The range includes both non-rising stem (NRS) and rising stem configurations, with screwed female ends conforming to IS 554 / BS 21 / ISO 7. All variants use premium PTFE gland packing and are available in Class 1 and Class 2 pressure ratings as per IS 778 or BS EN 12288 design standards.

These gate valves are suited for plant engineers requiring compact, space-saving isolation valves with tight shutoff. Models with provision for repacking under pressure allow maintenance without system shutdown, reducing downtime in critical applications.

Key Features

Bronze body construction – IS 318 Gr. LTB 2 for corrosion resistance in water and oil service
Forged brass bonnet, stem, and wedge – ensures durability and dimensional stability
Screwed female ends – conforms to IS 554 / BS 21 / ISO 7 for universal compatibility
Inside screw design – protects threads from media exposure
PTFE gland packing – premium quality for leak-free sealing up to rated temperatures
Provision for repacking under pressure – available on IS 778 Class 1 & Class 2 models
Sheet metal powder-coated handwheel – firm grip and convenient operation
Compact design – suitable for installations with space constraints

Specifications

Model	Type	Design Standard	Shell Test Pressure	Seat Test Pressure	Max. Temp.	Sizes Available
1006	NRS, Hex Type	–	24 kg/cm²g (340 psig)	16 kg/cm²g (225 psig)	225°C	1/4" to 4"
1007	NRS, Peg Type	BS EN 12288 (BS 5154)	25 kg/cm²g (350 psig)	16 kg/cm²g (225 psig)	225°C	1/4" to 4"
1035	NRS, Class 1	IS 778 Class 1	1.5 MPa	1.0 MPa	45°C	1/4" to 4"
1035A	NRS, Class 2	IS 778 Class 2	2.4 MPa	1.6 MPa	45°C	1/4" to 4"
1035B	Rising Stem, Class 1	IS 778 Class 1	1.5 MPa	1.0 MPa	45°C	1/2" to 4"
1035C	Rising Stem, Class 2	IS 778 Class 2	2.4 MPa	1.6 MPa	45°C	1/2" to 4"
Component	Material	Specification
Body	Bronze	IS 318 Gr. LTB 2
Bonnet	Forged Brass / Bronze	IS 6912 Gr. FLB / IS 318 Gr. LTB 2
Wedge	Forged Brass / Bronze	IS 6912 Gr. FLB / IS 318 Gr. LTB 2
Stem	Forged Brass	IS 6912 Gr. FLB
Gland & Gland Nut	Forged Brass	IS 6912 Gr. FLB
Gland Packing	PTFE	–
Handwheel	Sheet Metal (Powder Coated)	–
Size (Inches)	Size (mm)
1/4"	8
3/8"	10
1/2"	15
3/4"	20
1"	25
1-1/4"	32
1-1/2"	40
2"	50
2-1/2"	65
3"	80
4"	100

Applications

Zoloto bronze gate valves are used across industries for isolation of water and oil lines:

- Water treatment plants – raw water and treated water isolation - HVAC systems – chilled water and hot water circuits - Oil and lubricant lines – machinery lubrication systems - Fire protection systems – sprinkler and hydrant lines - Process industries – general utility water and non-corrosive fluid isolation - Building services – plumbing mains and branch isolation

Frequently Asked Questions

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