Krishna Industries (KELOR), based in Ahmedabad, Gujarat, is a B2B supplier of Gland Cock Valves (Plug Cock Valves) — Cast Iron (CI), WCB (carbon steel), SS304, SS316 body — bronze or SS plug — gland packed stem — screwed BSP (DN15–DN50) and flanged (DN50–DN300) — PN10 / PN16 (CI) / Class 150 (WCB / SS) — IS 903 / BS 5159 — GST invoice — MOQ 10 Nos — Pan India dispatch from Ahmedabad.
The gland cock valve — also called a plug cock or plug valve — is a quarter-turn valve using a tapered or cylindrical plug rotating inside a matching body bore. It remains widely specified in Indian municipal water supply, irrigation, power plant drain and vent, and industrial utility service for one primary reason: it is field repairable without removing the valve from the line. When the stem seal leaks, the gland nut is tightened. When the plug seal wears over years of service, the plug is withdrawn and re-ground against the body bore to restore metal-to-metal sealing — extending valve life indefinitely without replacing the valve body.
How a Gland Cock Valve Works
Inside the valve body is a tapered plug — cone-shaped — that fits into a matching tapered bore in the body. A port (hole) passes through the plug. When this port aligns with the pipeline bore, fluid flows freely. When the plug is rotated 90° by the lever or handwheel, the solid portion of the plug blocks the pipeline bore and flow stops.
The gland is the compression nut at the top of the plug stem. It compresses packing material — hemp, PTFE, or graphite — around the plug stem, providing a leak-free seal between the rotating stem and the body. As packing wears over time and the stem begins to weep, the maintenance team tightens the gland nut to restore compression — without shutting down the line or removing the valve. This is the defining maintenance advantage of the gland cock over a ball valve, which cannot be repaired in place when its PTFE seats wear.
Gland Cock vs Ball Valve — When to Specify Which
Feature
Gland Cock Valve (Plug Cock)
Ball Valve
Mechanism
Tapered plug in body bore — metal-to-metal contact — gland packed stem
Ball between two PTFE seats — no metal-to-metal body contact
Field Repairability
✅ Yes — gland nut tightening restores stem seal — plug re-grinding restores body seal — no parts replacement for normal wear
❌ No — worn PTFE seats cannot be repaired — valve must be replaced when seats leak
Indian Standard Compliance
✅ IS 903 — specified in Indian PWD, jal board, municipal corporation water supply tenders — IS-compliant supply with IS 903 marking
No equivalent IS standard for water supply isolation ball valve — not a direct substitute for IS 903 specification
Operating Torque
Higher than ball valve — tapered plug friction against body — leverage handle standard
✅ Municipal water supply (IS 903), irrigation distribution, ETP/STP, power plant cooling water drain — most economical specification — most common Indian municipal valve
WCB (Carbon Steel) ASTM A216 WCB
SS304 / SS316
Flanged Class 150 Screwed BSP/NPT
Industrial process utility — compressed air, steam condensate, oil utility, power plant auxiliary — higher pressure than CI — where CI body is excluded by project piping class
SS304 (CF8) ASTM A351 CF8
SS304
Flanged Class 150 Screwed BSP/NPT
Corrosion-resistant utility — DM water drain, pharma utility, food processing — where CI corrodes externally or internally
SS316 (CF8M) ASTM A351 CF8M
SS316
Flanged Class 150 Screwed BSP/NPT
Chemical utility, aggressive media, coastal service — highest corrosion resistance — chloride, acid, alkali service — where SS304 has insufficient pitting resistance
Screwed BSP (DN15–DN50) / Flanged EN 1092-1 PN10/PN16 or ASME B16.5 Class 150 (DN50–DN300)
Size Range
DN15 (½”) to DN300 (12″)
Pressure Rating
PN10 / PN16 (CI) — Class 150 (WCB / SS)
Operation
Lever (DN15–DN80) / Handwheel / Gear operated (DN150+)
Temperature Range
-10°C to +120°C (hemp/PTFE packing) / up to 300°C (graphite packing)
MOQ
10 Nos
HSN Code
84818030
Applications in Indian Industries
Municipal water supply — PWD, jal boards, municipal corporations — CI flanged PN16 DN50–DN300 — IS 903 specification — distribution main isolation, sluice chamber block valve, water meter bypass — government tenders specify “plug cock to IS 903” — direct IS 903 compliant supply with marking
Irrigation schemes — state irrigation departments — CI flanged PN10/PN16 DN80–DN200 — canal distribution block valves, field channel isolation, pump outlet isolation — robust against grit-laden irrigation water that would abrade PTFE ball valve seats
Power plant drain and vent cocks — WCB screwed BSP or flanged — DN15–DN50 — drain cocks on pipelines, vessels, heat exchangers, and headers — vent cocks on pump casings and pipe high points — standard item in power plant piping specifications
Industrial compressed air systems — CI or WCB screwed BSP DN15–DN50 — drain points on air receivers, air dryers, and distribution headers — manual drain cocks — simple, robust, no PTFE to degrade in compressed air with residual oil
Chemical process utility drain points — SS316 screwed BSP DN15–DN25 — chemical vessel drain cocks, equipment drain connections — SS316 body resists chemical attack on external body surface in corrosive atmosphere
General industrial utility — CI or WCB DN15–DN100 — cooling water drain, service water isolation, fire water drain cocks, boiler blowdown sample cocks — economical and robust for utility service
Related Products — Krishna Industries (KELOR)
Cast Iron Gate Valve — for larger bore municipal water main isolation where plug cock is not specified
SS Ball Valve — for process plant on-off isolation where low torque and full bore are required and field repairability is not a priority
SS Needle Valve — for precision small bore instrument isolation and sampling — finer throttling than plug cock
Y Strainer — install upstream of plug cock in irrigation and municipal water service to protect plug seat from grit and debris
WCB Globe Valve — for throttling service in process plant lines where plug cock on-off operation is insufficient
Frequently Asked Questions
1. What is the difference between a gland cock and a plug cock?
The terms are used interchangeably in Indian industry — both refer to the same valve type. “Plug cock” describes the valve mechanism — a plug rotating in a body bore. “Gland cock” refers to the gland packing arrangement on the plug stem — the gland nut that compresses packing to seal the stem. In Indian municipal water supply tenders and IS 903 specifications, “plug cock” is the formal term. In industrial and power plant specifications, “gland cock” is often used to distinguish it from a plain plug valve without gland packing. Krishna Industries supplies both under the same product range — CI, WCB, SS — screwed and flanged.
2. Why is IS 903 specified in Indian water supply tenders?
IS 903 is the Bureau of Indian Standards specification for plug cocks used in Indian water supply systems. PWD, jal boards, municipal corporations, and state water supply departments specify IS 903 plug cocks because the standard was written for Indian water supply conditions — grit-laden water, variable pressure, field maintenance by municipal workers. The IS 903 specification defines dimensions, body thickness, plug taper, gland arrangement, and pressure testing requirements for CI plug cocks used in Indian waterworks. A ball valve is not a substitute for an IS 903 plug cock on tenders that specifically call for this standard.
3. Can the plug be re-ground in the field?
Yes — this is the primary maintenance advantage of the plug cock over a ball valve. After depressurising and draining the line section, the gland nut is removed, the plug is withdrawn from the body, and the tapered plug surface is lapped against the body bore using grinding compound. This re-establishes the metal-to-metal sealing surface. The re-ground plug and body can provide another several years of service life. This field repair capability makes plug cocks preferred in remote irrigation schemes, rural water supply, and locations where valve replacement logistics are difficult.
4. What is the difference between a lubricated and non-lubricated plug cock?
A non-lubricated (plain) plug cock — IS 903 type — relies on metal-to-metal contact between plug and body, with gland packing on the stem. It requires periodic manual lubrication of the plug with grease for smooth operation, applied externally. A lubricated plug cock (API 599 type) has an integral grease fitting on the plug — sealant/lubricant is injected under pressure between the plug and body, providing both lubrication and secondary sealing. Lubricated plug cocks are specified for gas and oil service at higher pressure. For Indian water supply and utility service, the non-lubricated IS 903 type is standard.
5. What is the MOQ?
MOQ is 10 Nos. Municipal and irrigation project orders — 50 to 500+ Nos across sizes — with IS 903 compliance, dimensional inspection report, and GST invoice. WhatsApp body material, end connection (screwed or flanged), size list, pressure class, and quantity for project pricing within 2 hours.
Conclusion
The Gland Cock Valve (Plug Cock) supplied by Krishna Industries (KELOR) is the field-repairable quarter-turn isolation valve for Indian municipal water supply (IS 903), irrigation, power plant drain and vent, compressed air, and industrial utility service — Cast Iron (CI), WCB, SS304, SS316 body — bronze or SS plug — gland packed stem — screwed BSP (DN15–DN50) and flanged (DN50–DN300) — PN10 / PN16 / Class 150 — IS 903 compliant supply with marking — gland nut tightening and plug re-grinding extend service life without valve replacement. GST invoice, IS 903 compliance documentation, Pan India dispatch from Ahmedabad. WhatsApp body material, size list, end connection, and quantity for project pricing within 2 hours.
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