Cla-Val 90-01 Pilot-Operated Pressure Reducing Valve

Holding a steady downstream pressure whatever the demand

The Cla-Val 90-01 is a pilot-operated regulator that reduces a higher inlet pressure to a steady lower downstream pressure, regardless of changing flow rate or varying inlet pressure. A Hytrol 100-01 main valve is controlled by a CRD pressure-reducing pilot and an X58 restriction fitting. When downstream pressure rises above the pilot setting, the pilot and the main valve close drip-tight, so there is no creep of pressure on a dead-end system at night.

Cla-Val lists a fully supported, frictionless diaphragm, easy adjustment and service, an optional check feature and compliance with the lead reduction mandate for drinking water as the main benefits of the 90-01.

Technical specifications

Pilot ranges, options and variants

The pilot spring range is chosen at order: 2 to 30, 15 to 75, 20 to 105 or 30 to 300 psi, with 30 to 300 psi supplied unless another range is specified, and 150 to 600 psi with the CRD-18 pilot. Remote sensing is available. The standard pilot system is low-lead bronze with stainless steel trim and Buna-N rubber, with stainless steel or Monel optional, for water to 180 °F.

Variants named on the datasheet are 90-01KO with anti-cavitation trim, 90-01H with an X43H strainer, 90-01KOH with both, and the reduced-port 690-01 series with the same suffixes. Optional accessories are an X46A flow clean strainer, CK2 isolation valves, closing and opening speed controls (the closing control must stay at least three turns off its seat), a check valve with isolation valve, an X141 gauge and an X101D position indicator. For low flows, LFS trim regulates smoothly below the industry-standard 1 fps without losing capacity. Integral low-flow bypass versions are the 90-48 and 90-99.

Planning a pressure reducing station

For stations with a wide demand range, Cla-Val shows a large and a small 90-01 in parallel, the small valve handling night flows and the large one covering peak load, with a downstream relief valve also recommended. Where the pressure drop is high enough to cause cavitation, the 90-01KO is the datasheet recommendation; use the Cavitation Guide to check whether a valve is a candidate.

Suggested maximum continuous flow on the datasheet is 210 gpm at 2 in, 460 gpm at 3 in, 800 gpm at 4 in, 1,800 gpm at 6 in, 3,100 gpm at 8 in, 7,000 gpm at 12 in and 11,000 gpm at 16 in, with higher intermittent values. For sizes of 450 mm and larger Cla-Val points to the 90-66.

How the Cla-Val 90-01 works

A Hytrol main valve sits in the line. A pressure-reducing pilot senses the downstream pressure. When that pressure rises above the setting, the pilot closes the main valve. When it falls, the pilot opens the valve again. The downstream pressure stays steady.

Where the 90-01 is used

• Water supply lines
• Building water systems
• Pump discharge lines
• Pressure zones in networks
• Dead-end systems

Selection checklist for the 90-01

• Valve size
• Inlet pressure
• Downstream pressure setting
• Flow range
• Body material
• End connections
• Globe or angle pattern
• Pilot spring range

Installation, commissioning and maintenance notes for the 90-01

Flush the line before fitting the valve. Fit isolation valves on both sides. Set the pilot spring to the downstream pressure needed. Check that the valve closes tight at no flow. Inspect the pilot strainer at regular visits.

Requesting a quotation for the Cla-Val 90-01

Please send the size, the inlet pressure and the downstream setting. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.

90-01 valve type

It is a pilot-operated pressure reducing valve.

90-01 main valve

It uses a Hytrol 100-01 main valve.

90-01 pilot

A CRD pressure-reducing pilot controls it.

90-01 closing

The valve closes drip-tight when pressure is above the setting.

90-01 diaphragm

The diaphragm is fully supported and frictionless.

90-01 sizes

Sizes run from 1 to 36 in.

90-01 patterns

It comes in globe or angle patterns.

90-01 end connections

Ends are threaded, flanged or grooved.

90-01 body materials

Bodies are ductile iron, cast steel or bronze.

90-01 pilot ranges

Pilot ranges include 2 to 30, 15 to 75, 20 to 105 and 30 to 300 psi.

90-01 high pilot range

The CRD-18 pilot gives 150 to 600 psi.

90-01 trim

The standard trim is bronze with a Buna-N disc and diaphragm.

90-01 temperature

Water temperature is up to 180 degrees F.

90-01 remote sensing

Remote sensing is available.

90-01 check feature

An optional check feature is offered.

90-01 variants

Variants include 90-01KO, 90-01H and 690-01.

Valve records for the 90-01

Record the pilot setting, the inlet pressure and the date.

Choosing the right 90-01 size

Choose the size from the flow range of the line.

Documents and quotation

The engineering data sheet E-90-01 is attached, including imperial and metric dimension tables and the valve selection chart. To quote a 90-01, send the line size, pattern, end connection, pressure class, trim material, inlet and outlet pressure range, flow range and options. See also other pressure and flow valves under Control Valves.